diff --git a/LICENSES/BSD-1-Clause.txt b/LICENSES/BSD-1-Clause.txt
new file mode 100644
index 000000000000..b59f30b05d20
--- /dev/null
+++ b/LICENSES/BSD-1-Clause.txt
@@ -0,0 +1,5 @@
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/LICENSES/BSD-2-Clause.txt b/LICENSES/BSD-2-Clause.txt
new file mode 100644
index 000000000000..4763f1af5df7
--- /dev/null
+++ b/LICENSES/BSD-2-Clause.txt
@@ -0,0 +1,7 @@
+Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt
new file mode 100644
index 000000000000..0e259d42c996
--- /dev/null
+++ b/LICENSES/CC0-1.0.txt
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
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+
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+1. Copyright and Related Rights. A Work made available under CC0 may be
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+ vi. database rights (such as those arising under Directive 96/9/EC of the
+     European Parliament and of the Council of 11 March 1996 on the legal
+     protection of databases, and under any national implementation
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+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
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+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
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+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
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+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.
diff --git a/sys/include/analog_util.h b/sys/include/analog_util.h
index e359833770a9..13b01e514cc7 100644
--- a/sys/include/analog_util.h
+++ b/sys/include/analog_util.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/app_metadata.h b/sys/include/app_metadata.h
index 2cca7686738c..ee4c4e3f425e 100644
--- a/sys/include/app_metadata.h
+++ b/sys/include/app_metadata.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/architecture.h b/sys/include/architecture.h
index e562402d1098..78568fbb7231 100644
--- a/sys/include/architecture.h
+++ b/sys/include/architecture.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/atomic_utils.h b/sys/include/atomic_utils.h
index 97b3aaaaa9d7..c567f30c464e 100644
--- a/sys/include/atomic_utils.h
+++ b/sys/include/atomic_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/auto_init.h b/sys/include/auto_init.h
index d3237291207b..829f42bb7ca3 100644
--- a/sys/include/auto_init.h
+++ b/sys/include/auto_init.h
@@ -1,11 +1,9 @@
 /*
- * Copyright (C) 2010,2015 Freie Universität Berlin
- * Copyright (C) 2010 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2013-2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2010 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2010 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2013-2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/auto_init_utils.h b/sys/include/auto_init_utils.h
index bef5b8071611..b2506ce84b47 100644
--- a/sys/include/auto_init_utils.h
+++ b/sys/include/auto_init_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Otto-von-Guericke-Universität Magdebug
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Otto-von-Guericke-Universität Magdebug
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/base64.h b/sys/include/base64.h
index 1ab9a2373c31..b41efba06abf 100644
--- a/sys/include/base64.h
+++ b/sys/include/base64.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Hochschule für Angewandte Wissenschaften Hamburg (HAW)
- * Copyright (C) 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Hochschule für Angewandte Wissenschaften Hamburg (HAW)
+ * SPDX-FileCopyrightText: 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bcd.h b/sys/include/bcd.h
index 86f593d4a1e8..79df188bbb62 100644
--- a/sys/include/bcd.h
+++ b/sys/include/bcd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/benchmark.h b/sys/include/benchmark.h
index db4ff9685837..80cb45dbc4ce 100644
--- a/sys/include/benchmark.h
+++ b/sys/include/benchmark.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017,2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bhp.h b/sys/include/bhp.h
index 088cb9669f29..dda3546539ce 100644
--- a/sys/include/bhp.h
+++ b/sys/include/bhp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bhp/event.h b/sys/include/bhp/event.h
index 9d7b83e9bd8d..15b486091817 100644
--- a/sys/include/bhp/event.h
+++ b/sys/include/bhp/event.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bhp/msg.h b/sys/include/bhp/msg.h
index 9babef82d04c..a8e0273cf06c 100644
--- a/sys/include/bhp/msg.h
+++ b/sys/include/bhp/msg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bit.h b/sys/include/bit.h
index ee53ac540176..a29862f8a37c 100644
--- a/sys/include/bit.h
+++ b/sys/include/bit.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bitfield.h b/sys/include/bitfield.h
index aaf7e91cbe03..4e4b1e06ff35 100644
--- a/sys/include/bitfield.h
+++ b/sys/include/bitfield.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/bloom.h b/sys/include/bloom.h
index c06d06f29fc4..79c5efec1e0c 100644
--- a/sys/include/bloom.h
+++ b/sys/include/bloom.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/busy_wait.h b/sys/include/busy_wait.h
index 17503896233b..36abe8e388d0 100644
--- a/sys/include/busy_wait.h
+++ b/sys/include/busy_wait.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/byteorder.h b/sys/include/byteorder.h
index e4822dcf2c7b..b492cdf06755 100644
--- a/sys/include/byteorder.h
+++ b/sys/include/byteorder.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 René Kijewski
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 René Kijewski
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/can.h b/sys/include/can/can.h
index e9f1afe9f90f..22a26a7244a0 100644
--- a/sys/include/can/can.h
+++ b/sys/include/can/can.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/common.h b/sys/include/can/common.h
index 443f0e43c513..776d443027a9 100644
--- a/sys/include/can/common.h
+++ b/sys/include/can/common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/conn/isotp.h b/sys/include/can/conn/isotp.h
index 14b8c8ada932..9e9bf3eab169 100644
--- a/sys/include/can/conn/isotp.h
+++ b/sys/include/can/conn/isotp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/conn/raw.h b/sys/include/can/conn/raw.h
index 7a3af937d532..f878d9d03d03 100644
--- a/sys/include/can/conn/raw.h
+++ b/sys/include/can/conn/raw.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/device.h b/sys/include/can/device.h
index 4aba0c1f3c42..9d5501076b92 100644
--- a/sys/include/can/device.h
+++ b/sys/include/can/device.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/dll.h b/sys/include/can/dll.h
index b7ac34c9ee16..b1d9496aa058 100644
--- a/sys/include/can/dll.h
+++ b/sys/include/can/dll.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/isotp.h b/sys/include/can/isotp.h
index a824c58cc9c1..ceab067ebc17 100644
--- a/sys/include/can/isotp.h
+++ b/sys/include/can/isotp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/pkt.h b/sys/include/can/pkt.h
index afe9f9e1b82c..d3ee3709335a 100644
--- a/sys/include/can/pkt.h
+++ b/sys/include/can/pkt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016-2018 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016-2018 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/raw.h b/sys/include/can/raw.h
index 66a3350d1bf8..15bff792c6a5 100644
--- a/sys/include/can/raw.h
+++ b/sys/include/can/raw.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/can/router.h b/sys/include/can/router.h
index a1c271dd8dfc..003204bc525c 100644
--- a/sys/include/can/router.h
+++ b/sys/include/can/router.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016-2018 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2016-2018 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/cb_mux.h b/sys/include/cb_mux.h
index 2c6ccfebe266..7624cb408875 100644
--- a/sys/include/cb_mux.h
+++ b/sys/include/cb_mux.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Acutam Automation, LLC
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Acutam Automation, LLC
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/crc16_ccitt.h b/sys/include/checksum/crc16_ccitt.h
index d9d845b65d69..695bb7aa3933 100644
--- a/sys/include/checksum/crc16_ccitt.h
+++ b/sys/include/checksum/crc16_ccitt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/crc32.h b/sys/include/checksum/crc32.h
index 1a6dd4ad85e7..752ade58020b 100644
--- a/sys/include/checksum/crc32.h
+++ b/sys/include/checksum/crc32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/crc8.h b/sys/include/checksum/crc8.h
index 7df120a08b70..10173ec6c74d 100644
--- a/sys/include/checksum/crc8.h
+++ b/sys/include/checksum/crc8.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Gunar Schorcht
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Gunar Schorcht
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/fletcher16.h b/sys/include/checksum/fletcher16.h
index 3df5040cf316..9ba0f8ad21f7 100644
--- a/sys/include/checksum/fletcher16.h
+++ b/sys/include/checksum/fletcher16.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/fletcher32.h b/sys/include/checksum/fletcher32.h
index cd1ec97c1861..eaf6057e58dd 100644
--- a/sys/include/checksum/fletcher32.h
+++ b/sys/include/checksum/fletcher32.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/checksum/ucrc16.h b/sys/include/checksum/ucrc16.h
index 9ca7a6db70fe..11c2b98b26f4 100644
--- a/sys/include/checksum/ucrc16.h
+++ b/sys/include/checksum/ucrc16.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/chunked_ringbuffer.h b/sys/include/chunked_ringbuffer.h
index 65c6b16ee308..57950c0976e8 100644
--- a/sys/include/chunked_ringbuffer.h
+++ b/sys/include/chunked_ringbuffer.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/clif.h b/sys/include/clif.h
index 941a74dedbb4..1f317ed94870 100644
--- a/sys/include/clif.h
+++ b/sys/include/clif.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/clk.h b/sys/include/clk.h
index 0f22015cf280..e520e4d5b692 100644
--- a/sys/include/clk.h
+++ b/sys/include/clk.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/coding/xor.h b/sys/include/coding/xor.h
index 2fea3c25dcd4..cb11a73a93d5 100644
--- a/sys/include/coding/xor.h
+++ b/sys/include/coding/xor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/color.h b/sys/include/color.h
index 0afd90896404..47f9d04fd6d7 100644
--- a/sys/include/color.h
+++ b/sys/include/color.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 - 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2014-2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure.h b/sys/include/congure.h
index 623bbe7b8364..c7b1a3f9f787 100644
--- a/sys/include/congure.h
+++ b/sys/include/congure.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/abe.h b/sys/include/congure/abe.h
index 254a632d8ff3..6bdc6604ed4d 100644
--- a/sys/include/congure/abe.h
+++ b/sys/include/congure/abe.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/config.h b/sys/include/congure/config.h
index 4c768ada2bce..3e8d9858eb10 100644
--- a/sys/include/congure/config.h
+++ b/sys/include/congure/config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/mock.h b/sys/include/congure/mock.h
index 4f81e05ff37b..2c11ada54af2 100644
--- a/sys/include/congure/mock.h
+++ b/sys/include/congure/mock.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/quic.h b/sys/include/congure/quic.h
index 66701131efd6..d996d64d8b54 100644
--- a/sys/include/congure/quic.h
+++ b/sys/include/congure/quic.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/reno.h b/sys/include/congure/reno.h
index 6e0afeb7cc81..29d07aa4c54f 100644
--- a/sys/include/congure/reno.h
+++ b/sys/include/congure/reno.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/congure/test.h b/sys/include/congure/test.h
index 888c8e7fa3be..2670608b878d 100644
--- a/sys/include/congure/test.h
+++ b/sys/include/congure/test.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/aes.h b/sys/include/crypto/aes.h
index 302af0703cd3..ddbff3a37281 100644
--- a/sys/include/crypto/aes.h
+++ b/sys/include/crypto/aes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2013 Freie Universität Berlin, Computer Systems & Telematics
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 Freie Universität Berlin, Computer Systems & Telematics
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/chacha.h b/sys/include/crypto/chacha.h
index 6fa2510cfbcc..18c4af015ce2 100644
--- a/sys/include/crypto/chacha.h
+++ b/sys/include/crypto/chacha.h
@@ -1,24 +1,7 @@
 /*
- * Copyright (C) 2008  D. J. Bernstein  (dedicated to the public domain)
- * Copyright (C) 2015  René Kijewski  <rene.kijewski@fu-berlin.de>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
+ * SPDX-FileCopyrightText: 2008 D. J. Bernstein  (dedicated to the public domain)
+ * SPDX-FileCopyrightText: 2015 René Kijewski  <rene.kijewski@fu-berlin.de>
+ * SPDX-License-Identifier: MIT
  */
 
 #pragma once
diff --git a/sys/include/crypto/chacha20poly1305.h b/sys/include/crypto/chacha20poly1305.h
index abc441f64f6a..5b1cff5e74bc 100644
--- a/sys/include/crypto/chacha20poly1305.h
+++ b/sys/include/crypto/chacha20poly1305.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/ciphers.h b/sys/include/crypto/ciphers.h
index 0a379c4890af..69ef5d4a9468 100644
--- a/sys/include/crypto/ciphers.h
+++ b/sys/include/crypto/ciphers.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2013 Freie Universität Berlin, Computer Systems & Telematics
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 Freie Universität Berlin, Computer Systems & Telematics
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/helper.h b/sys/include/crypto/helper.h
index 3f9e2107df76..9d7a86832464 100644
--- a/sys/include/crypto/helper.h
+++ b/sys/include/crypto/helper.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/modes/cbc.h b/sys/include/crypto/modes/cbc.h
index 8b4a006f5774..05f23c0f3e3a 100644
--- a/sys/include/crypto/modes/cbc.h
+++ b/sys/include/crypto/modes/cbc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/modes/ccm.h b/sys/include/crypto/modes/ccm.h
index 620eaf6ead4a..4f440acc6013 100644
--- a/sys/include/crypto/modes/ccm.h
+++ b/sys/include/crypto/modes/ccm.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/modes/ctr.h b/sys/include/crypto/modes/ctr.h
index e5234d8cb3ee..6c1da9f5b1a8 100644
--- a/sys/include/crypto/modes/ctr.h
+++ b/sys/include/crypto/modes/ctr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/modes/ecb.h b/sys/include/crypto/modes/ecb.h
index 6e2239f17328..ea8ee5f203b0 100644
--- a/sys/include/crypto/modes/ecb.h
+++ b/sys/include/crypto/modes/ecb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/modes/ocb.h b/sys/include/crypto/modes/ocb.h
index 5816a1cec1ff..44333b7e07dd 100644
--- a/sys/include/crypto/modes/ocb.h
+++ b/sys/include/crypto/modes/ocb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Mathias Tausig
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Mathias Tausig
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/poly1305.h b/sys/include/crypto/poly1305.h
index 581e75575d01..731812a48fb3 100644
--- a/sys/include/crypto/poly1305.h
+++ b/sys/include/crypto/poly1305.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2016 Andrew Moon (dedicated to the public domain)
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Andrew Moon (dedicated to the public domain)
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/crypto/psa/riot_ciphers.h b/sys/include/crypto/psa/riot_ciphers.h
index eaf06fcc705e..2258cc4384b5 100644
--- a/sys/include/crypto/psa/riot_ciphers.h
+++ b/sys/include/crypto/psa/riot_ciphers.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/dbgpin.h b/sys/include/dbgpin.h
index e1883311eaa0..42ef57830395 100644
--- a/sys/include/dbgpin.h
+++ b/sys/include/dbgpin.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/debug_irq_disable.h b/sys/include/debug_irq_disable.h
index 8df8c321b92f..6084df39d75b 100644
--- a/sys/include/debug_irq_disable.h
+++ b/sys/include/debug_irq_disable.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/div.h b/sys/include/div.h
index a44d70e478af..0c6362d3a0a1 100644
--- a/sys/include/div.h
+++ b/sys/include/div.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ecc/golay2412.h b/sys/include/ecc/golay2412.h
index cdd06d52958f..a4ba69698350 100644
--- a/sys/include/ecc/golay2412.h
+++ b/sys/include/ecc/golay2412.h
@@ -1,24 +1,7 @@
 /*
- * Copyright (c) 2007 - 2015 Joseph Gaeddert
- * Copyright (c) 2018        HAW Hamburg
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
+ * SPDX-FileCopyrightText: 2007-2015 Joseph Gaeddert
+ * SPDX-FileCopyrightText: 2018 HAW Hamburg
+ * SPDX-License-Identifier: MIT
  */
 
 #pragma once
diff --git a/sys/include/ecc/hamming256.h b/sys/include/ecc/hamming256.h
index 010e772ebffa..ead24b6d9538 100644
--- a/sys/include/ecc/hamming256.h
+++ b/sys/include/ecc/hamming256.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Lucas Jenß
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Lucas Jenß
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ecc/repetition.h b/sys/include/ecc/repetition.h
index 4aa57839ff4d..a4ec1130ab47 100644
--- a/sys/include/ecc/repetition.h
+++ b/sys/include/ecc/repetition.h
@@ -1,24 +1,7 @@
 /*
- * Copyright (c) 2007 - 2015 Joseph Gaeddert
- * Copyright (c) 2018        HAW Hamburg
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
+ * SPDX-FileCopyrightText: 2007-2015 Joseph Gaeddert
+ * SPDX-FileCopyrightText: 2018 HAW Hamburg
+ * SPDX-License-Identifier: MIT
  */
 
 #pragma once
diff --git a/sys/include/eepreg.h b/sys/include/eepreg.h
index e898afa585ba..0184626bc063 100644
--- a/sys/include/eepreg.h
+++ b/sys/include/eepreg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Acutam Automation, LLC
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Acutam Automation, LLC
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/embUnit.h b/sys/include/embUnit.h
index 90f3bcee53af..bc2edbc2065f 100644
--- a/sys/include/embUnit.h
+++ b/sys/include/embUnit.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/sys/include/embUnit/AssertImpl.h b/sys/include/embUnit/AssertImpl.h
index a6c344581ea3..4a0959f92b4e 100644
--- a/sys/include/embUnit/AssertImpl.h
+++ b/sys/include/embUnit/AssertImpl.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: AssertImpl.h,v 1.6 2003/09/16 11:09:53 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_ASSERTIMPL_H
 #define EMBUNIT_ASSERTIMPL_H
diff --git a/sys/include/embUnit/ColorOutputter.h b/sys/include/embUnit/ColorOutputter.h
index f704eefbeb3c..0b6de2613fe3 100644
--- a/sys/include/embUnit/ColorOutputter.h
+++ b/sys/include/embUnit/ColorOutputter.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Janos Kutscherauer <noshky@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Janos Kutscherauer <noshky@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/embUnit/ColorTextOutputter.h b/sys/include/embUnit/ColorTextOutputter.h
index eb5330ef0a78..bd4da9409b38 100644
--- a/sys/include/embUnit/ColorTextOutputter.h
+++ b/sys/include/embUnit/ColorTextOutputter.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Janos Kutscherauer <noshky@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Janos Kutscherauer <noshky@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/embUnit/CompilerOutputter.h b/sys/include/embUnit/CompilerOutputter.h
index 49b4fb8a832c..5d51dc13607c 100644
--- a/sys/include/embUnit/CompilerOutputter.h
+++ b/sys/include/embUnit/CompilerOutputter.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: CompilerOutputter.h,v 1.2 2003/09/06 13:28:27 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_COMPILEROUTPUTTER_H
 #define EMBUNIT_COMPILEROUTPUTTER_H
diff --git a/sys/include/embUnit/HelperMacro.h b/sys/include/embUnit/HelperMacro.h
index 448997d50f9e..127c19c3f67e 100644
--- a/sys/include/embUnit/HelperMacro.h
+++ b/sys/include/embUnit/HelperMacro.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: HelperMacro.h,v 1.3 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_HELPERMACRO_H
 #define EMBUNIT_HELPERMACRO_H
diff --git a/sys/include/embUnit/Outputter.h b/sys/include/embUnit/Outputter.h
index 5644cadb3868..bcc0918c3ed6 100644
--- a/sys/include/embUnit/Outputter.h
+++ b/sys/include/embUnit/Outputter.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: Outputter.h,v 1.2 2003/09/06 13:28:27 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_OUTPUTTER_H
 #define EMBUNIT_OUTPUTTER_H
diff --git a/sys/include/embUnit/RepeatedTest.h b/sys/include/embUnit/RepeatedTest.h
index a2fa7ccf2aa3..091bebfb2422 100644
--- a/sys/include/embUnit/RepeatedTest.h
+++ b/sys/include/embUnit/RepeatedTest.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: RepeatedTest.h,v 1.7 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_REPEATEDTEST_H
 #define EMBUNIT_REPEATEDTEST_H
diff --git a/sys/include/embUnit/Test.h b/sys/include/embUnit/Test.h
index 20a512dd8d75..f7ef8a3b3be3 100644
--- a/sys/include/embUnit/Test.h
+++ b/sys/include/embUnit/Test.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: Test.h,v 1.4 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TEST_H
 #define EMBUNIT_TEST_H
diff --git a/sys/include/embUnit/TestCaller.h b/sys/include/embUnit/TestCaller.h
index c99bb4a37570..ba5caa43c1e8 100644
--- a/sys/include/embUnit/TestCaller.h
+++ b/sys/include/embUnit/TestCaller.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestCaller.h,v 1.7 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTCALLER_H
 #define EMBUNIT_TESTCALLER_H
diff --git a/sys/include/embUnit/TestCase.h b/sys/include/embUnit/TestCase.h
index e191145400c8..1a2bbaaf2e7e 100644
--- a/sys/include/embUnit/TestCase.h
+++ b/sys/include/embUnit/TestCase.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestCase.h,v 1.7 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTCASE_H
 #define EMBUNIT_TESTCASE_H
diff --git a/sys/include/embUnit/TestListener.h b/sys/include/embUnit/TestListener.h
index e8a49d7bc163..4e1123dc92bb 100644
--- a/sys/include/embUnit/TestListener.h
+++ b/sys/include/embUnit/TestListener.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestListener.h,v 1.4 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTLISTENER_H
 #define EMBUNIT_TESTLISTENER_H
diff --git a/sys/include/embUnit/TestResult.h b/sys/include/embUnit/TestResult.h
index d3f555a57132..b81c08cbfa20 100644
--- a/sys/include/embUnit/TestResult.h
+++ b/sys/include/embUnit/TestResult.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestResult.h,v 1.7 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTRESULT_H
 #define EMBUNIT_TESTRESULT_H
diff --git a/sys/include/embUnit/TestRunner.h b/sys/include/embUnit/TestRunner.h
index a469154c7754..d830cfcc26d2 100644
--- a/sys/include/embUnit/TestRunner.h
+++ b/sys/include/embUnit/TestRunner.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestRunner.h,v 1.6 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTRUNNER_H
 #define EMBUNIT_TESTRUNNER_H
diff --git a/sys/include/embUnit/TestSuite.h b/sys/include/embUnit/TestSuite.h
index b88cebcf6422..1e41b5db4e73 100644
--- a/sys/include/embUnit/TestSuite.h
+++ b/sys/include/embUnit/TestSuite.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TestSuite.h,v 1.7 2004/02/10 16:19:29 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TESTSUITE_H
 #define EMBUNIT_TESTSUITE_H
diff --git a/sys/include/embUnit/TextOutputter.h b/sys/include/embUnit/TextOutputter.h
index 29d6ad2ac3c3..2acf69409ae8 100644
--- a/sys/include/embUnit/TextOutputter.h
+++ b/sys/include/embUnit/TextOutputter.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TextOutputter.h,v 1.2 2003/09/06 13:28:27 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TEXTOUTPUTTER_H
 #define EMBUNIT_TEXTOUTPUTTER_H
diff --git a/sys/include/embUnit/TextUIRunner.h b/sys/include/embUnit/TextUIRunner.h
index c2a6d6fe1b29..33e0ff8c7c66 100644
--- a/sys/include/embUnit/TextUIRunner.h
+++ b/sys/include/embUnit/TextUIRunner.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: TextUIRunner.h,v 1.3 2003/09/06 13:28:27 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_TEXTUIRUNNER_H
 #define EMBUNIT_TEXTUIRUNNER_H
diff --git a/sys/include/embUnit/XMLOutputter.h b/sys/include/embUnit/XMLOutputter.h
index 31497f8eabbc..cf88f14afbe7 100644
--- a/sys/include/embUnit/XMLOutputter.h
+++ b/sys/include/embUnit/XMLOutputter.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: XMLOutputter.h,v 1.3 2003/09/06 13:28:27 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_XMLOUTPUTTER_H
 #define EMBUNIT_XMLOUTPUTTER_H
diff --git a/sys/include/embUnit/embUnit.h b/sys/include/embUnit/embUnit.h
index 8a1e4b7fb5b5..9fe2c0a93db9 100644
--- a/sys/include/embUnit/embUnit.h
+++ b/sys/include/embUnit/embUnit.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: embUnit.h,v 1.4 2004/02/10 16:16:19 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_EMBUNIT_H
 #define EMBUNIT_EMBUNIT_H
diff --git a/sys/include/embUnit/embUnit_config.h b/sys/include/embUnit/embUnit_config.h
index 334e38136000..a9c859c630d3 100644
--- a/sys/include/embUnit/embUnit_config.h
+++ b/sys/include/embUnit/embUnit_config.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: config.h,v 1.7 2004/02/10 16:17:07 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_EMBUNIT_CONFIG_H
 #define EMBUNIT_EMBUNIT_CONFIG_H
diff --git a/sys/include/embUnit/stdImpl.h b/sys/include/embUnit/stdImpl.h
index 7ae60e55acb5..162226feafe5 100644
--- a/sys/include/embUnit/stdImpl.h
+++ b/sys/include/embUnit/stdImpl.h
@@ -1,36 +1,6 @@
 /*
- * COPYRIGHT AND PERMISSION NOTICE
- *
- * Copyright (c) 2003 Embedded Unit Project
- *
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, and/or sell copies of the Software, and to permit persons
- * to whom the Software is furnished to do so, provided that the above
- * copyright notice(s) and this permission notice appear in all copies
- * of the Software and that both the above copyright notice(s) and this
- * permission notice appear in supporting documentation.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
- * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
- * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
- * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
- * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Except as contained in this notice, the name of a copyright holder
- * shall not be used in advertising or otherwise to promote the sale,
- * use or other dealings in this Software without prior written
- * authorization of the copyright holder.
- *
- * $Id: stdImpl.h,v 1.4 2004/02/10 16:15:25 arms22 Exp $
+ * SPDX-FileCopyrightText: 2003 Embedded Unit Project
+ * SPDX-License-Identifier: MIT
  */
 #ifndef EMBUNIT_STDIMPL_H
 #define EMBUNIT_STDIMPL_H
diff --git a/sys/include/endian.h b/sys/include/endian.h
index bbea081ed0be..e052e1fb2db1 100644
--- a/sys/include/endian.h
+++ b/sys/include/endian.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2024 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/entropy_source.h b/sys/include/entropy_source.h
index 4e6eabf19ac8..04fad2f318a3 100644
--- a/sys/include/entropy_source.h
+++ b/sys/include/entropy_source.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/entropy_source/adc_noise.h b/sys/include/entropy_source/adc_noise.h
index b7985a9a8ee9..5eac15cfd83d 100644
--- a/sys/include/entropy_source/adc_noise.h
+++ b/sys/include/entropy_source/adc_noise.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/entropy_source/zero_entropy.h b/sys/include/entropy_source/zero_entropy.h
index d3778b3db9bf..20ce4b40fe04 100644
--- a/sys/include/entropy_source/zero_entropy.h
+++ b/sys/include/entropy_source/zero_entropy.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event.h b/sys/include/event.h
index 4abec2fa73c1..9dbe2b3a81b9 100644
--- a/sys/include/event.h
+++ b/sys/include/event.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2017 Inria
- *               2017 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018-2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Inria
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018-2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/callback.h b/sys/include/event/callback.h
index 59c01b55c5d2..e2f00d71e538 100644
--- a/sys/include/event/callback.h
+++ b/sys/include/event/callback.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2017 Inria
- *               2017 Freie Universität Berlin
- *               2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Inria
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/deferred_callback.h b/sys/include/event/deferred_callback.h
index 9e9f3d2623d2..460e68534ef5 100644
--- a/sys/include/event/deferred_callback.h
+++ b/sys/include/event/deferred_callback.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2025 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/periodic.h b/sys/include/event/periodic.h
index 18397186acaf..6738e043ef5d 100644
--- a/sys/include/event/periodic.h
+++ b/sys/include/event/periodic.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/periodic_callback.h b/sys/include/event/periodic_callback.h
index f7d44e11859e..ea51b384b162 100644
--- a/sys/include/event/periodic_callback.h
+++ b/sys/include/event/periodic_callback.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/source.h b/sys/include/event/source.h
index 96c9c0909769..6dab5de6d1de 100644
--- a/sys/include/event/source.h
+++ b/sys/include/event/source.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/thread.h b/sys/include/event/thread.h
index 1e277bee4089..dfe13a588c0e 100644
--- a/sys/include/event/thread.h
+++ b/sys/include/event/thread.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
- *               2020 Freie Universität Berlin
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/event/timeout.h b/sys/include/event/timeout.h
index 2bf2fb0082a1..05d8ae1db8a0 100644
--- a/sys/include/event/timeout.h
+++ b/sys/include/event/timeout.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2017 Inria
- *               2017 Freie Universität Berlin
- *               2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Inria
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/evtimer.h b/sys/include/evtimer.h
index 8556547c3d17..ed7e18338901 100644
--- a/sys/include/evtimer.h
+++ b/sys/include/evtimer.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016-17 Kaspar Schleiser <kaspar@schleiser.de>
- *               2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016-2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/evtimer_mbox.h b/sys/include/evtimer_mbox.h
index 5703172dcebe..cc8b5ad3d668 100644
--- a/sys/include/evtimer_mbox.h
+++ b/sys/include/evtimer_mbox.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Simon Brummer <simon.brummer@posteo.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Simon Brummer <simon.brummer@posteo.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/evtimer_msg.h b/sys/include/evtimer_msg.h
index d37ab8db7e32..ddc0d3e11c1c 100644
--- a/sys/include/evtimer_msg.h
+++ b/sys/include/evtimer_msg.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016-17 Kaspar Schleiser <kaspar@schleiser.de>
- *               2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016-2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap.h b/sys/include/fido2/ctap.h
index 8d2f44346989..defd0c3f0db7 100644
--- a/sys/include/fido2/ctap.h
+++ b/sys/include/fido2/ctap.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/ctap.h b/sys/include/fido2/ctap/ctap.h
index e4fc3978c6d3..c70b672bda8d 100644
--- a/sys/include/fido2/ctap/ctap.h
+++ b/sys/include/fido2/ctap/ctap.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/ctap_cbor.h b/sys/include/fido2/ctap/ctap_cbor.h
index c28095ba4ac5..f1f6b7ad61a5 100644
--- a/sys/include/fido2/ctap/ctap_cbor.h
+++ b/sys/include/fido2/ctap/ctap_cbor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/ctap_crypto.h b/sys/include/fido2/ctap/ctap_crypto.h
index 6059bd1a432f..d6cae5ce1253 100644
--- a/sys/include/fido2/ctap/ctap_crypto.h
+++ b/sys/include/fido2/ctap/ctap_crypto.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/ctap_mem.h b/sys/include/fido2/ctap/ctap_mem.h
index a2f52554647c..9a7e040d629a 100644
--- a/sys/include/fido2/ctap/ctap_mem.h
+++ b/sys/include/fido2/ctap/ctap_mem.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/ctap_utils.h b/sys/include/fido2/ctap/ctap_utils.h
index 31bfbff8e734..4179f82796bc 100644
--- a/sys/include/fido2/ctap/ctap_utils.h
+++ b/sys/include/fido2/ctap/ctap_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/transport/ctap_transport.h b/sys/include/fido2/ctap/transport/ctap_transport.h
index 5e23ec461eae..f32e848e17e4 100644
--- a/sys/include/fido2/ctap/transport/ctap_transport.h
+++ b/sys/include/fido2/ctap/transport/ctap_transport.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fido2/ctap/transport/hid/ctap_hid.h b/sys/include/fido2/ctap/transport/hid/ctap_hid.h
index 552215283e05..3ae4fe8374ed 100644
--- a/sys/include/fido2/ctap/transport/hid/ctap_hid.h
+++ b/sys/include/fido2/ctap/transport/hid/ctap_hid.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/flash_utils.h b/sys/include/flash_utils.h
index c633d99699af..ed0ac775a23a 100644
--- a/sys/include/flash_utils.h
+++ b/sys/include/flash_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fmt.h b/sys/include/fmt.h
index 75a36a764861..bc88d73cbb4f 100644
--- a/sys/include/fmt.h
+++ b/sys/include/fmt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fmt_table.h b/sys/include/fmt_table.h
index 652aae4e284c..9ff0fad96514 100644
--- a/sys/include/fmt_table.h
+++ b/sys/include/fmt_table.h
@@ -1,9 +1,6 @@
 /*
- * Copyright 2019 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/frac.h b/sys/include/frac.h
index bd4dfe6f5153..7b70ac4c1b24 100644
--- a/sys/include/frac.h
+++ b/sys/include/frac.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/constfs.h b/sys/include/fs/constfs.h
index a8fd7a15881c..26d276d77d99 100644
--- a/sys/include/fs/constfs.h
+++ b/sys/include/fs/constfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/devfs.h b/sys/include/fs/devfs.h
index 597f22e78c85..c37da756c452 100644
--- a/sys/include/fs/devfs.h
+++ b/sys/include/fs/devfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/fatfs.h b/sys/include/fs/fatfs.h
index 8f58a011026c..6b5774ef031e 100644
--- a/sys/include/fs/fatfs.h
+++ b/sys/include/fs/fatfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 HAW-Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 HAW-Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/littlefs2_fs.h b/sys/include/fs/littlefs2_fs.h
index c6b4e73ef67f..1a6ee3ccff4f 100644
--- a/sys/include/fs/littlefs2_fs.h
+++ b/sys/include/fs/littlefs2_fs.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2017 OTA keys S.A.
- * Copyright (C) 2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 OTA keys S.A.
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/littlefs_fs.h b/sys/include/fs/littlefs_fs.h
index 4cc9363dbff0..edb7a8f231b0 100644
--- a/sys/include/fs/littlefs_fs.h
+++ b/sys/include/fs/littlefs_fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/lwext4_fs.h b/sys/include/fs/lwext4_fs.h
index 90df79288f98..03804306c836 100644
--- a/sys/include/fs/lwext4_fs.h
+++ b/sys/include/fs/lwext4_fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/native_fs.h b/sys/include/fs/native_fs.h
index d1700371e8ee..09e327b0af75 100644
--- a/sys/include/fs/native_fs.h
+++ b/sys/include/fs/native_fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/spiffs_fs.h b/sys/include/fs/spiffs_fs.h
index 4cbf9e2afbb8..be387e846265 100644
--- a/sys/include/fs/spiffs_fs.h
+++ b/sys/include/fs/spiffs_fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 OTA keys S.A.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/fs/xipfs_fs.h b/sys/include/fs/xipfs_fs.h
index ce3f0827adc4..062d87937531 100644
--- a/sys/include/fs/xipfs_fs.h
+++ b/sys/include/fs/xipfs_fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 Université de Lille
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 Université de Lille
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 /**
diff --git a/sys/include/fuzzing.h b/sys/include/fuzzing.h
index 14c51ef99184..7a26e3cd6cd4 100644
--- a/sys/include/fuzzing.h
+++ b/sys/include/fuzzing.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2019 Sören Tempel <tempel@uni-bremen.de>
- * Copyright (C) 2022 Bennet Blischke <bennet.blischke@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Sören Tempel <tempel@uni-bremen.de>
+ * SPDX-FileCopyrightText: 2022 Bennet Blischke <bennet.blischke@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes.h b/sys/include/hashes.h
index 07456fde3e6e..6496d4078a3c 100644
--- a/sys/include/hashes.h
+++ b/sys/include/hashes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2013 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/aes128_cmac.h b/sys/include/hashes/aes128_cmac.h
index 02022272f116..046a1715b628 100644
--- a/sys/include/hashes/aes128_cmac.h
+++ b/sys/include/hashes/aes128_cmac.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Fundación Inria Chile
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Fundación Inria Chile
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/md5.h b/sys/include/hashes/md5.h
index a1ffb675b4c2..a6744244691f 100644
--- a/sys/include/hashes/md5.h
+++ b/sys/include/hashes/md5.h
@@ -1,20 +1,7 @@
 /*
- * Copyright (C) 2003-2005 by Christopher R. Hertel
- *               2015 Freie Universität Berlin
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Lesser General Public
- *  License as published by the Free Software Foundation; either
- *  version 2.1 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Lesser General Public License for more details.
- *
- *  You should have received a copy of the GNU Lesser General Public
- *  License along with this library; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * SPDX-FileCopyrightText: 2003-2005 by Christopher R. Hertel
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #pragma once
diff --git a/sys/include/hashes/pbkdf2.h b/sys/include/hashes/pbkdf2.h
index 8fd6c0a3f990..4b0bc6c21ac0 100644
--- a/sys/include/hashes/pbkdf2.h
+++ b/sys/include/hashes/pbkdf2.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/psa/riot_hashes.h b/sys/include/hashes/psa/riot_hashes.h
index 9d95ea60bccf..0e5d9f058927 100644
--- a/sys/include/hashes/psa/riot_hashes.h
+++ b/sys/include/hashes/psa/riot_hashes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha1.h b/sys/include/hashes/sha1.h
index 2f0625a0e6fa..102512466e0e 100644
--- a/sys/include/hashes/sha1.h
+++ b/sys/include/hashes/sha1.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha224.h b/sys/include/hashes/sha224.h
index f62fcb2ecec2..4973780c59ba 100644
--- a/sys/include/hashes/sha224.h
+++ b/sys/include/hashes/sha224.h
@@ -1,33 +1,10 @@
-/*-
- * Copyright 2005 Colin Percival
- * Copyright 2013 Christian Mehlis & René Kijewski
- * Copyright 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- * Copyright 2016 OTA keys S.A.
- * Copyright 2020 HAW Hamburg
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD: src/lib/libmd/sha256.h,v 1.1.2.1 2005/06/24 13:32:25 cperciva Exp $
+/*
+ * SPDX-FileCopyrightText: 2005 Colin Percival
+ * SPDX-FileCopyrightText: 2013 Christian Mehlis & René Kijewski
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha256.h b/sys/include/hashes/sha256.h
index 23677a39c91b..be87e14fc405 100644
--- a/sys/include/hashes/sha256.h
+++ b/sys/include/hashes/sha256.h
@@ -1,32 +1,9 @@
 /*-
- * Copyright 2005 Colin Percival
- * Copyright 2013 Christian Mehlis & René Kijewski
- * Copyright 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- * Copyright 2016 OTA keys S.A.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD: src/lib/libmd/sha256.h,v 1.1.2.1 2005/06/24 13:32:25 cperciva Exp $
+ * SPDX-FileCopyrightText: 2005 Colin Percival
+ * SPDX-FileCopyrightText: 2013 Christian Mehlis & René Kijewski
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha2xx_common.h b/sys/include/hashes/sha2xx_common.h
index 5d64572f13f7..90a5d5a41c73 100644
--- a/sys/include/hashes/sha2xx_common.h
+++ b/sys/include/hashes/sha2xx_common.h
@@ -1,33 +1,10 @@
 /*-
- * Copyright 2005 Colin Percival
- * Copyright 2013 Christian Mehlis & René Kijewski
- * Copyright 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- * Copyright 2016 OTA keys S.A.
- * Copyright 2020 HAW Hamburg
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD: src/lib/libmd/sha256.h,v 1.1.2.1 2005/06/24 13:32:25 cperciva Exp $
+ * SPDX-FileCopyrightText: 2005 Colin Percival
+ * SPDX-FileCopyrightText: 2013 Christian Mehlis & René Kijewski
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-FileCopyrightText: 2016 OTA keys S.A.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha3.h b/sys/include/hashes/sha3.h
index 8bd5c04d0f9b..7a9aad89c432 100644
--- a/sys/include/hashes/sha3.h
+++ b/sys/include/hashes/sha3.h
@@ -1,14 +1,12 @@
-/*-
- * Implementation by the Keccak, Keyak and Ketje Teams, namely, Guido Bertoni,
- * Joan Daemen, Michaël Peeters, Gilles Van Assche and Ronny Van Keer, hereby
- * denoted as "the implementer".
- *
- * RIOT-OS adaptation by Mathias Tausig
- *
- * This software is released under the Creative Commons CC0 1.0 license.
- * To the extent possible under law, the implementer has waived all copyright
- * and related or neighboring rights to the source code in this file.
- * For more information see: http://creativecommons.org/publicdomain/zero/1.0/
+/*
+ * SPDX-FileCopyrightText: Keccak, Keyak and Ketje Teams
+ * SPDX-FileCopyrightText: Guido Bertoni
+ * SPDX-FileCopyrightText: Joan Daemen
+ * SPDX-FileCopyrightText: Michaël Peeters
+ * SPDX-FileCopyrightText: Gilles Van Assche
+ * SPDX-FileCopyrightText: Ronny Van Keer
+ * SPDX-FileCopyrightText: Mathias Tausig
+ * SPDX-License-Identifier: CC0-1.0
  */
 
 /**
diff --git a/sys/include/hashes/sha384.h b/sys/include/hashes/sha384.h
index 1fd017ce649c..84508ae179ba 100644
--- a/sys/include/hashes/sha384.h
+++ b/sys/include/hashes/sha384.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha512.h b/sys/include/hashes/sha512.h
index df263444b164..dc2bd2cb17f0 100644
--- a/sys/include/hashes/sha512.h
+++ b/sys/include/hashes/sha512.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha512_224.h b/sys/include/hashes/sha512_224.h
index 75190b4afcaf..5bb93bd2b850 100644
--- a/sys/include/hashes/sha512_224.h
+++ b/sys/include/hashes/sha512_224.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha512_256.h b/sys/include/hashes/sha512_256.h
index 6d7acf52ea1f..43adb5ffdb14 100644
--- a/sys/include/hashes/sha512_256.h
+++ b/sys/include/hashes/sha512_256.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/hashes/sha512_common.h b/sys/include/hashes/sha512_common.h
index d3c212bbf5be..e29e55797ff6 100644
--- a/sys/include/hashes/sha512_common.h
+++ b/sys/include/hashes/sha512_common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/imath.h b/sys/include/imath.h
index 449ab057ffc6..1d9c1fec6475 100644
--- a/sys/include/imath.h
+++ b/sys/include/imath.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/iolist.h b/sys/include/iolist.h
index 82a380da93a5..272ceed77050 100644
--- a/sys/include/iolist.h
+++ b/sys/include/iolist.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Inria
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/isrpipe.h b/sys/include/isrpipe.h
index 6b43f562a6d5..4aa067f39057 100644
--- a/sys/include/isrpipe.h
+++ b/sys/include/isrpipe.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/isrpipe/read_timeout.h b/sys/include/isrpipe/read_timeout.h
index 67a73d48741c..983bae62dcd9 100644
--- a/sys/include/isrpipe/read_timeout.h
+++ b/sys/include/isrpipe/read_timeout.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/luid.h b/sys/include/luid.h
index 5f0bc8b92764..7526c3819f3c 100644
--- a/sys/include/luid.h
+++ b/sys/include/luid.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/malloc_monitor.h b/sys/include/malloc_monitor.h
index a512c0fef842..4b050d69498d 100644
--- a/sys/include/malloc_monitor.h
+++ b/sys/include/malloc_monitor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/malloc_monitor_internal.h b/sys/include/malloc_monitor_internal.h
index 0ef6dc92a712..b543ef079f35 100644
--- a/sys/include/malloc_monitor_internal.h
+++ b/sys/include/malloc_monitor_internal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/matstat.h b/sys/include/matstat.h
index 17a1b0be99c1..92193ef273da 100644
--- a/sys/include/matstat.h
+++ b/sys/include/matstat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/memarray.h b/sys/include/memarray.h
index a2fb2704f568..bb6f03d3fcb8 100644
--- a/sys/include/memarray.h
+++ b/sys/include/memarray.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Tobias Heider <heidert@nm.ifi.lmu.de>
- *               2020 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Tobias Heider <heidert@nm.ifi.lmu.de>
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/mineplex.h b/sys/include/mineplex.h
index 316b2e8846c7..1178546db8c1 100644
--- a/sys/include/mineplex.h
+++ b/sys/include/mineplex.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/af.h b/sys/include/net/af.h
index 331b5460d94a..63c7a0b65bc9 100644
--- a/sys/include/net/af.h
+++ b/sys/include/net/af.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/arp.h b/sys/include/net/arp.h
index ee5b3b1ad9d5..d1baca738756 100644
--- a/sys/include/net/arp.h
+++ b/sys/include/net/arp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/asymcute.h b/sys/include/net/asymcute.h
index 5cfea1f8c940..7139ccb09724 100644
--- a/sys/include/net/asymcute.h
+++ b/sys/include/net/asymcute.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ble.h b/sys/include/net/ble.h
index 811362f5b60e..2c3ec21d152a 100644
--- a/sys/include/net/ble.h
+++ b/sys/include/net/ble.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/bluetil/ad.h b/sys/include/net/bluetil/ad.h
index 174104095c22..f06b30f42c31 100644
--- a/sys/include/net/bluetil/ad.h
+++ b/sys/include/net/bluetil/ad.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018,2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018-2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/bluetil/addr.h b/sys/include/net/bluetil/addr.h
index 6d9433d2d1b6..2c5d89af674b 100644
--- a/sys/include/net/bluetil/addr.h
+++ b/sys/include/net/bluetil/addr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/coap.h b/sys/include/net/coap.h
index ada1f3b57358..c70cf420fa52 100644
--- a/sys/include/net/coap.h
+++ b/sys/include/net/coap.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/common.h b/sys/include/net/cord/common.h
index 74579ce4a34a..1eef22d3fca4 100644
--- a/sys/include/net/cord/common.h
+++ b/sys/include/net/cord/common.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017,2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/config.h b/sys/include/net/cord/config.h
index 1bd5f30c9e2c..02a498b8017e 100644
--- a/sys/include/net/cord/config.h
+++ b/sys/include/net/cord/config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/ep.h b/sys/include/net/cord/ep.h
index 8b9966921d37..eff3a01c8e0d 100644
--- a/sys/include/net/cord/ep.h
+++ b/sys/include/net/cord/ep.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/ep_standalone.h b/sys/include/net/cord/ep_standalone.h
index 441bebc3f25e..d0e7576f1170 100644
--- a/sys/include/net/cord/ep_standalone.h
+++ b/sys/include/net/cord/ep_standalone.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/epsim.h b/sys/include/net/cord/epsim.h
index e1a271dd1d6e..18e4e2390a66 100644
--- a/sys/include/net/cord/epsim.h
+++ b/sys/include/net/cord/epsim.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/cord/lc.h b/sys/include/net/cord/lc.h
index 77d6e5315a2d..bef47efe1e57 100644
--- a/sys/include/net/cord/lc.h
+++ b/sys/include/net/cord/lc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/credman.h b/sys/include/net/credman.h
index c164598cae60..c75d752b67f8 100644
--- a/sys/include/net/credman.h
+++ b/sys/include/net/credman.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/csma_sender.h b/sys/include/net/csma_sender.h
index fbc1add8f04f..d62d50b517e1 100644
--- a/sys/include/net/csma_sender.h
+++ b/sys/include/net/csma_sender.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 INRIA
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 INRIA
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dhcpv6.h b/sys/include/net/dhcpv6.h
index 0d29a4c1ee49..a8415607cd20 100644
--- a/sys/include/net/dhcpv6.h
+++ b/sys/include/net/dhcpv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dhcpv6/client.h b/sys/include/net/dhcpv6/client.h
index a942fd72105c..d48d7794044e 100644
--- a/sys/include/net/dhcpv6/client.h
+++ b/sys/include/net/dhcpv6/client.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dhcpv6/relay.h b/sys/include/net/dhcpv6/relay.h
index 708d24e6d2ce..914db00398b8 100644
--- a/sys/include/net/dhcpv6/relay.h
+++ b/sys/include/net/dhcpv6/relay.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dns.h b/sys/include/net/dns.h
index f149339af2bd..05c929348587 100644
--- a/sys/include/net/dns.h
+++ b/sys/include/net/dns.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dns/cache.h b/sys/include/net/dns/cache.h
index 6191369320df..059cab5384df 100644
--- a/sys/include/net/dns/cache.h
+++ b/sys/include/net/dns/cache.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dns/msg.h b/sys/include/net/dns/msg.h
index 3c3f678be3dd..d8f913e7f704 100644
--- a/sys/include/net/dns/msg.h
+++ b/sys/include/net/dns/msg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dns_mock.h b/sys/include/net/dns_mock.h
index 778b0b244c1d..75946b0fb8e6 100644
--- a/sys/include/net/dns_mock.h
+++ b/sys/include/net/dns_mock.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dsm.h b/sys/include/net/dsm.h
index fd033301420e..838d21c1d27b 100644
--- a/sys/include/net/dsm.h
+++ b/sys/include/net/dsm.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/dtls.h b/sys/include/net/dtls.h
index c0076c040ca6..117922b6a4cb 100644
--- a/sys/include/net/dtls.h
+++ b/sys/include/net/dtls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/eddystone.h b/sys/include/net/eddystone.h
index 9a15fbeffc53..aaa400677445 100644
--- a/sys/include/net/eddystone.h
+++ b/sys/include/net/eddystone.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/emcute.h b/sys/include/net/emcute.h
index 003e120eb517..a9cbe752012a 100644
--- a/sys/include/net/emcute.h
+++ b/sys/include/net/emcute.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ethernet.h b/sys/include/net/ethernet.h
index a41b8ff0ca8d..daace7b4d9da 100644
--- a/sys/include/net/ethernet.h
+++ b/sys/include/net/ethernet.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ethernet/hdr.h b/sys/include/net/ethernet/hdr.h
index f6eaf2f7be7d..0ba788cae56e 100644
--- a/sys/include/net/ethernet/hdr.h
+++ b/sys/include/net/ethernet/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ethertype.h b/sys/include/net/ethertype.h
index e12031e20d4c..0100ff64d465 100644
--- a/sys/include/net/ethertype.h
+++ b/sys/include/net/ethertype.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/eui48.h b/sys/include/net/eui48.h
index 7851c70d408c..67ac134f903b 100644
--- a/sys/include/net/eui48.h
+++ b/sys/include/net/eui48.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/eui64.h b/sys/include/net/eui64.h
index b7423ea53451..fa571704d542 100644
--- a/sys/include/net/eui64.h
+++ b/sys/include/net/eui64.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/eui_provider.h b/sys/include/net/eui_provider.h
index 2ba7ed36e384..454ffff261ac 100644
--- a/sys/include/net/eui_provider.h
+++ b/sys/include/net/eui_provider.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/fib.h b/sys/include/net/fib.h
index 5087ffd5c9ab..ee97cb30cbed 100644
--- a/sys/include/net/fib.h
+++ b/sys/include/net/fib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014  Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/fib/table.h b/sys/include/net/fib/table.h
index 6aeff824fba0..2f932a60b11c 100644
--- a/sys/include/net/fib/table.h
+++ b/sys/include/net/fib/table.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014  Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gcoap.h b/sys/include/net/gcoap.h
index 01938ab45e8f..5e864351ca57 100644
--- a/sys/include/net/gcoap.h
+++ b/sys/include/net/gcoap.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (c) 2015-2017 Ken Bannister. All rights reserved.
- *               2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2017 Ken Bannister. All rights reserved.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gcoap/dns.h b/sys/include/net/gcoap/dns.h
index 749061ed43f0..12abd00c0895 100644
--- a/sys/include/net/gcoap/dns.h
+++ b/sys/include/net/gcoap/dns.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gcoap/forward_proxy.h b/sys/include/net/gcoap/forward_proxy.h
index 61969aeff04e..89ece9f6e3d0 100644
--- a/sys/include/net/gcoap/forward_proxy.h
+++ b/sys/include/net/gcoap/forward_proxy.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc.h b/sys/include/net/gnrc.h
index c970eb963869..7532ece7d8bb 100644
--- a/sys/include/net/gnrc.h
+++ b/sys/include/net/gnrc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/dhcpv6/client/simple_pd.h b/sys/include/net/gnrc/dhcpv6/client/simple_pd.h
index aaf470efa7bc..e6ffc6fb1530 100644
--- a/sys/include/net/gnrc/dhcpv6/client/simple_pd.h
+++ b/sys/include/net/gnrc/dhcpv6/client/simple_pd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/icmpv6.h b/sys/include/net/gnrc/icmpv6.h
index b44c993d1591..c781d2f1ef0d 100644
--- a/sys/include/net/gnrc/icmpv6.h
+++ b/sys/include/net/gnrc/icmpv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/icmpv6/echo.h b/sys/include/net/gnrc/icmpv6/echo.h
index f5a5dd043c2f..631c74abb537 100644
--- a/sys/include/net/gnrc/icmpv6/echo.h
+++ b/sys/include/net/gnrc/icmpv6/echo.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/icmpv6/error.h b/sys/include/net/gnrc/icmpv6/error.h
index bb4ecce0c7d4..770025e05119 100644
--- a/sys/include/net/gnrc/icmpv6/error.h
+++ b/sys/include/net/gnrc/icmpv6/error.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6.h b/sys/include/net/gnrc/ipv6.h
index 7208561a0cd1..fe12de36b38a 100644
--- a/sys/include/net/gnrc/ipv6.h
+++ b/sys/include/net/gnrc/ipv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/blacklist.h b/sys/include/net/gnrc/ipv6/blacklist.h
index 796eddeff415..4569d070e992 100644
--- a/sys/include/net/gnrc/ipv6/blacklist.h
+++ b/sys/include/net/gnrc/ipv6/blacklist.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- * Copyright (C) 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2016 Martin Landsmann <martin.landsmann@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/ext.h b/sys/include/net/gnrc/ipv6/ext.h
index 167806ec9926..59747f666332 100644
--- a/sys/include/net/gnrc/ipv6/ext.h
+++ b/sys/include/net/gnrc/ipv6/ext.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/ext/frag.h b/sys/include/net/gnrc/ipv6/ext/frag.h
index dbcc292c2faa..f8bd1468bf06 100644
--- a/sys/include/net/gnrc/ipv6/ext/frag.h
+++ b/sys/include/net/gnrc/ipv6/ext/frag.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/ext/opt.h b/sys/include/net/gnrc/ipv6/ext/opt.h
index 8fa110822cca..7de43e1fdbac 100644
--- a/sys/include/net/gnrc/ipv6/ext/opt.h
+++ b/sys/include/net/gnrc/ipv6/ext/opt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/ext/rh.h b/sys/include/net/gnrc/ipv6/ext/rh.h
index 78ad4e3ebe7c..9f47cef794dc 100644
--- a/sys/include/net/gnrc/ipv6/ext/rh.h
+++ b/sys/include/net/gnrc/ipv6/ext/rh.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/hdr.h b/sys/include/net/gnrc/ipv6/hdr.h
index 7989661a81b4..5358cfbdb0eb 100644
--- a/sys/include/net/gnrc/ipv6/hdr.h
+++ b/sys/include/net/gnrc/ipv6/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib.h b/sys/include/net/gnrc/ipv6/nib.h
index 92be21ebd023..8594543a366b 100644
--- a/sys/include/net/gnrc/ipv6/nib.h
+++ b/sys/include/net/gnrc/ipv6/nib.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib/abr.h b/sys/include/net/gnrc/ipv6/nib/abr.h
index 73be590008ca..863663b4ba1c 100644
--- a/sys/include/net/gnrc/ipv6/nib/abr.h
+++ b/sys/include/net/gnrc/ipv6/nib/abr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib/conf.h b/sys/include/net/gnrc/ipv6/nib/conf.h
index 4bcebcebc690..4840f0225902 100644
--- a/sys/include/net/gnrc/ipv6/nib/conf.h
+++ b/sys/include/net/gnrc/ipv6/nib/conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib/ft.h b/sys/include/net/gnrc/ipv6/nib/ft.h
index 883f3370463a..6d30e8da4bb8 100644
--- a/sys/include/net/gnrc/ipv6/nib/ft.h
+++ b/sys/include/net/gnrc/ipv6/nib/ft.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib/nc.h b/sys/include/net/gnrc/ipv6/nib/nc.h
index 5ac6a119264a..35edbbe89c08 100644
--- a/sys/include/net/gnrc/ipv6/nib/nc.h
+++ b/sys/include/net/gnrc/ipv6/nib/nc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/nib/pl.h b/sys/include/net/gnrc/ipv6/nib/pl.h
index 226bdace926a..39a04ef471bc 100644
--- a/sys/include/net/gnrc/ipv6/nib/pl.h
+++ b/sys/include/net/gnrc/ipv6/nib/pl.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ipv6/whitelist.h b/sys/include/net/gnrc/ipv6/whitelist.h
index bd2bd704affa..114286e5c27f 100644
--- a/sys/include/net/gnrc/ipv6/whitelist.h
+++ b/sys/include/net/gnrc/ipv6/whitelist.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/lorawan.h b/sys/include/net/gnrc/lorawan.h
index 7054125a302b..8a5b92dc671d 100644
--- a/sys/include/net/gnrc/lorawan.h
+++ b/sys/include/net/gnrc/lorawan.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2017 Fundación Inria Chile
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Fundación Inria Chile
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/lorawan/region.h b/sys/include/net/gnrc/lorawan/region.h
index af597038a603..ff72213bd786 100644
--- a/sys/include/net/gnrc/lorawan/region.h
+++ b/sys/include/net/gnrc/lorawan/region.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/ndp.h b/sys/include/net/gnrc/ndp.h
index 1cf4651b9e3e..01a735863e73 100644
--- a/sys/include/net/gnrc/ndp.h
+++ b/sys/include/net/gnrc/ndp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netapi.h b/sys/include/net/gnrc/netapi.h
index ea8157e40899..1724e68225b6 100644
--- a/sys/include/net/gnrc/netapi.h
+++ b/sys/include/net/gnrc/netapi.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/neterr.h b/sys/include/net/gnrc/neterr.h
index e40fccff0a07..90059c41318c 100644
--- a/sys/include/net/gnrc/neterr.h
+++ b/sys/include/net/gnrc/neterr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif.h b/sys/include/net/gnrc/netif.h
index 8723d5c1fed4..3f2d5254209f 100644
--- a/sys/include/net/gnrc/netif.h
+++ b/sys/include/net/gnrc/netif.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017-20 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017-2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/6lo.h b/sys/include/net/gnrc/netif/6lo.h
index 02d4b67296e6..d7fc3de9373d 100644
--- a/sys/include/net/gnrc/netif/6lo.h
+++ b/sys/include/net/gnrc/netif/6lo.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/conf.h b/sys/include/net/gnrc/netif/conf.h
index d8adde9fadbe..ae24a2245bfc 100644
--- a/sys/include/net/gnrc/netif/conf.h
+++ b/sys/include/net/gnrc/netif/conf.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/dedup.h b/sys/include/net/gnrc/netif/dedup.h
index 4910b4bd7a17..d861f7adf221 100644
--- a/sys/include/net/gnrc/netif/dedup.h
+++ b/sys/include/net/gnrc/netif/dedup.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/ethernet.h b/sys/include/net/gnrc/netif/ethernet.h
index dfe85a968432..9760b8d1c7c6 100644
--- a/sys/include/net/gnrc/netif/ethernet.h
+++ b/sys/include/net/gnrc/netif/ethernet.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/flags.h b/sys/include/net/gnrc/netif/flags.h
index 9892e1d7300e..2f8ba997731d 100644
--- a/sys/include/net/gnrc/netif/flags.h
+++ b/sys/include/net/gnrc/netif/flags.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/hdr.h b/sys/include/net/gnrc/netif/hdr.h
index dd7154bef7b3..f2aeb2e0bc50 100644
--- a/sys/include/net/gnrc/netif/hdr.h
+++ b/sys/include/net/gnrc/netif/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/ieee802154.h b/sys/include/net/gnrc/netif/ieee802154.h
index c1ed3098cc70..802a6ecc2e17 100644
--- a/sys/include/net/gnrc/netif/ieee802154.h
+++ b/sys/include/net/gnrc/netif/ieee802154.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/internal.h b/sys/include/net/gnrc/netif/internal.h
index 6cfc6c38f3c0..075d33a736f6 100644
--- a/sys/include/net/gnrc/netif/internal.h
+++ b/sys/include/net/gnrc/netif/internal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/ipv6.h b/sys/include/net/gnrc/netif/ipv6.h
index b1cb1c3d3c3c..1dcb336c8e75 100644
--- a/sys/include/net/gnrc/netif/ipv6.h
+++ b/sys/include/net/gnrc/netif/ipv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/lorawan.h b/sys/include/net/gnrc/netif/lorawan.h
index caa121795ff3..3c66b7d5ac91 100644
--- a/sys/include/net/gnrc/netif/lorawan.h
+++ b/sys/include/net/gnrc/netif/lorawan.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/lorawan_base.h b/sys/include/net/gnrc/netif/lorawan_base.h
index a69c18650bd5..4b3124ca760e 100644
--- a/sys/include/net/gnrc/netif/lorawan_base.h
+++ b/sys/include/net/gnrc/netif/lorawan_base.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/pktq.h b/sys/include/net/gnrc/netif/pktq.h
index f13f6dc86d6e..a5ce98568ed6 100644
--- a/sys/include/net/gnrc/netif/pktq.h
+++ b/sys/include/net/gnrc/netif/pktq.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019-20 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019-2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/pktq/type.h b/sys/include/net/gnrc/netif/pktq/type.h
index 4aff116aa274..b666bbd7cff7 100644
--- a/sys/include/net/gnrc/netif/pktq/type.h
+++ b/sys/include/net/gnrc/netif/pktq/type.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019-20 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019-2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netif/raw.h b/sys/include/net/gnrc/netif/raw.h
index 3b04632e1d20..459127a04cc7 100644
--- a/sys/include/net/gnrc/netif/raw.h
+++ b/sys/include/net/gnrc/netif/raw.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/netreg.h b/sys/include/net/gnrc/netreg.h
index ad48958850a9..114a64fdfb35 100644
--- a/sys/include/net/gnrc/netreg.h
+++ b/sys/include/net/gnrc/netreg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/nettype.h b/sys/include/net/gnrc/nettype.h
index 85ca4fccb175..2ae837cde718 100644
--- a/sys/include/net/gnrc/nettype.h
+++ b/sys/include/net/gnrc/nettype.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/pkt.h b/sys/include/net/gnrc/pkt.h
index e62eea80e711..cd13e814628f 100644
--- a/sys/include/net/gnrc/pkt.h
+++ b/sys/include/net/gnrc/pkt.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014, 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *               2015       Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014-2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/pktbuf.h b/sys/include/net/gnrc/pktbuf.h
index fa0d89b934c5..d5b36c9d1898 100644
--- a/sys/include/net/gnrc/pktbuf.h
+++ b/sys/include/net/gnrc/pktbuf.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *               2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/pktdump.h b/sys/include/net/gnrc/pktdump.h
index 2e4d68e3482f..70e7e2d1f317 100644
--- a/sys/include/net/gnrc/pktdump.h
+++ b/sys/include/net/gnrc/pktdump.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/pktqueue.h b/sys/include/net/gnrc/pktqueue.h
index a97f1d9bcf2b..214a52dc39a2 100644
--- a/sys/include/net/gnrc/pktqueue.h
+++ b/sys/include/net/gnrc/pktqueue.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014, 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2014-2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/priority_pktqueue.h b/sys/include/net/gnrc/priority_pktqueue.h
index 6085279dca75..2d92a40047ca 100644
--- a/sys/include/net/gnrc/priority_pktqueue.h
+++ b/sys/include/net/gnrc/priority_pktqueue.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Daniel Krebs
- *               2016 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Daniel Krebs
+ * SPDX-FileCopyrightText: 2016 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl.h b/sys/include/net/gnrc/rpl.h
index dbdc2b1c52d6..9e6ab18d4448 100644
--- a/sys/include/net/gnrc/rpl.h
+++ b/sys/include/net/gnrc/rpl.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2013 - 2014  INRIA.
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- * Copyright (C) 2015 - 2018 Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013-2014 INRIA
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2015-2018 Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/dodag.h b/sys/include/net/gnrc/rpl/dodag.h
index e23c543748d3..46d0c419e5eb 100644
--- a/sys/include/net/gnrc/rpl/dodag.h
+++ b/sys/include/net/gnrc/rpl/dodag.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2013  INRIA.
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 INRIA
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/of_manager.h b/sys/include/net/gnrc/rpl/of_manager.h
index c42da0b4115f..7516bb4eee6c 100644
--- a/sys/include/net/gnrc/rpl/of_manager.h
+++ b/sys/include/net/gnrc/rpl/of_manager.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/p2p.h b/sys/include/net/gnrc/rpl/p2p.h
index c53dd076cae9..1a5d44f06ea1 100644
--- a/sys/include/net/gnrc/rpl/p2p.h
+++ b/sys/include/net/gnrc/rpl/p2p.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Cenk Gündoğan <mail@cgundogan.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Cenk Gündoğan <mail@cgundogan.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/p2p_dodag.h b/sys/include/net/gnrc/rpl/p2p_dodag.h
index 9a6143417c27..b8daad302abb 100644
--- a/sys/include/net/gnrc/rpl/p2p_dodag.h
+++ b/sys/include/net/gnrc/rpl/p2p_dodag.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Cenk Gündoğan <mail@cgundogan.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Cenk Gündoğan <mail@cgundogan.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/p2p_structs.h b/sys/include/net/gnrc/rpl/p2p_structs.h
index f263bb4187fa..6c2515030d2f 100644
--- a/sys/include/net/gnrc/rpl/p2p_structs.h
+++ b/sys/include/net/gnrc/rpl/p2p_structs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/rpble.h b/sys/include/net/gnrc/rpl/rpble.h
index 1dcd7c07431a..a1ff95bd32f6 100644
--- a/sys/include/net/gnrc/rpl/rpble.h
+++ b/sys/include/net/gnrc/rpl/rpble.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/srh.h b/sys/include/net/gnrc/rpl/srh.h
index ee63d53e931c..9eb21730c378 100644
--- a/sys/include/net/gnrc/rpl/srh.h
+++ b/sys/include/net/gnrc/rpl/srh.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/rpl/structs.h b/sys/include/net/gnrc/rpl/structs.h
index fc80056834eb..9722d0b242c6 100644
--- a/sys/include/net/gnrc/rpl/structs.h
+++ b/sys/include/net/gnrc/rpl/structs.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2017       HAW Hamburg
- * Copyright (C) 2015–2018  Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
- * Copyright (C) 2013       INRIA.
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 HAW Hamburg
+ * SPDX-FileCopyrightText: 2015–2018 Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
+ * SPDX-FileCopyrightText: 2013 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan.h b/sys/include/net/gnrc/sixlowpan.h
index 19f142a28e0b..66308e0a5b8c 100644
--- a/sys/include/net/gnrc/sixlowpan.h
+++ b/sys/include/net/gnrc/sixlowpan.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/config.h b/sys/include/net/gnrc/sixlowpan/config.h
index 86e6906c5671..c4e33c11a77d 100644
--- a/sys/include/net/gnrc/sixlowpan/config.h
+++ b/sys/include/net/gnrc/sixlowpan/config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/ctx.h b/sys/include/net/gnrc/sixlowpan/ctx.h
index 57dc66af80c3..6fbd5da8b27c 100644
--- a/sys/include/net/gnrc/sixlowpan/ctx.h
+++ b/sys/include/net/gnrc/sixlowpan/ctx.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag.h b/sys/include/net/gnrc/sixlowpan/frag.h
index a0669f105e18..14fb9525fb4d 100644
--- a/sys/include/net/gnrc/sixlowpan/frag.h
+++ b/sys/include/net/gnrc/sixlowpan/frag.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- * Copyright (C) 2015 Hamburg University of Applied Sciences
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-FileCopyrightText: 2015 Hamburg University of Applied Sciences
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/fb.h b/sys/include/net/gnrc/sixlowpan/frag/fb.h
index e23ea8f1c50d..ae01e5907b93 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/fb.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/fb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/hint.h b/sys/include/net/gnrc/sixlowpan/frag/hint.h
index 4fe16c4bbbf5..a71604723d7f 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/hint.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/hint.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/minfwd.h b/sys/include/net/gnrc/sixlowpan/frag/minfwd.h
index e8c31bdb724a..8a082dedc83f 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/minfwd.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/minfwd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/rb.h b/sys/include/net/gnrc/sixlowpan/frag/rb.h
index 12527503a341..40853bc9029b 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/rb.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/rb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/sfr.h b/sys/include/net/gnrc/sixlowpan/frag/sfr.h
index 859e0db6fcac..61236e0e726c 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/sfr.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/sfr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/sfr/congure.h b/sys/include/net/gnrc/sixlowpan/frag/sfr/congure.h
index 72071e3cbffa..2fbd0b74bd1e 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/sfr/congure.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/sfr/congure.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/sfr_types.h b/sys/include/net/gnrc/sixlowpan/frag/sfr_types.h
index ee1282a37ee4..d89ec71d6839 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/sfr_types.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/sfr_types.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/stats.h b/sys/include/net/gnrc/sixlowpan/frag/stats.h
index cfa0ae4e8a16..20d46421591e 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/stats.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/stats.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/frag/vrb.h b/sys/include/net/gnrc/sixlowpan/frag/vrb.h
index 9db996091d4c..d3cac5e61037 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/vrb.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/vrb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/internal.h b/sys/include/net/gnrc/sixlowpan/internal.h
index 879dd66c73ce..00598e37c7fb 100644
--- a/sys/include/net/gnrc/sixlowpan/internal.h
+++ b/sys/include/net/gnrc/sixlowpan/internal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/iphc.h b/sys/include/net/gnrc/sixlowpan/iphc.h
index 7e57cc5cde7a..182dcc062104 100644
--- a/sys/include/net/gnrc/sixlowpan/iphc.h
+++ b/sys/include/net/gnrc/sixlowpan/iphc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/sixlowpan/nd.h b/sys/include/net/gnrc/sixlowpan/nd.h
index 826ab6f00c5a..5b2d6f590713 100644
--- a/sys/include/net/gnrc/sixlowpan/nd.h
+++ b/sys/include/net/gnrc/sixlowpan/nd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/tcp.h b/sys/include/net/gnrc/tcp.h
index 39d859dea8b6..9c93b64c6fe8 100644
--- a/sys/include/net/gnrc/tcp.h
+++ b/sys/include/net/gnrc/tcp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015-2017 Simon Brummer
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2017 Simon Brummer
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/tcp/config.h b/sys/include/net/gnrc/tcp/config.h
index 9147b0888aa4..d400a8509d58 100644
--- a/sys/include/net/gnrc/tcp/config.h
+++ b/sys/include/net/gnrc/tcp/config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015-2017 Simon Brummer
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2017 Simon Brummer
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/tcp/tcb.h b/sys/include/net/gnrc/tcp/tcb.h
index 773ed9686daa..7e9a377a3aa3 100644
--- a/sys/include/net/gnrc/tcp/tcb.h
+++ b/sys/include/net/gnrc/tcp/tcb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015-2017 Simon Brummer
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2017 Simon Brummer
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/tx_sync.h b/sys/include/net/gnrc/tx_sync.h
index f597b0446f03..f3f9390b27e5 100644
--- a/sys/include/net/gnrc/tx_sync.h
+++ b/sys/include/net/gnrc/tx_sync.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/gnrc/udp.h b/sys/include/net/gnrc/udp.h
index 8a5969bdce61..ad5f0da834a7 100644
--- a/sys/include/net/gnrc/udp.h
+++ b/sys/include/net/gnrc/udp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/iana/portrange.h b/sys/include/net/iana/portrange.h
index cbef4d74acbf..b9cd130033de 100644
--- a/sys/include/net/iana/portrange.h
+++ b/sys/include/net/iana/portrange.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/icmp.h b/sys/include/net/icmp.h
index d4da42cd2a83..aab54b886307 100644
--- a/sys/include/net/icmp.h
+++ b/sys/include/net/icmp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 José Ignacio Alamos <jialamos@uc.cl>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 José Ignacio Alamos <jialamos@uc.cl>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/icmpv6.h b/sys/include/net/icmpv6.h
index a5bd68496bda..2da4923e6692 100644
--- a/sys/include/net/icmpv6.h
+++ b/sys/include/net/icmpv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ieee802154.h b/sys/include/net/ieee802154.h
index 173cbb36fbed..56aa609325fc 100644
--- a/sys/include/net/ieee802154.h
+++ b/sys/include/net/ieee802154.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015-2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ieee802154/radio.h b/sys/include/net/ieee802154/radio.h
index 9528e9a4dce3..04951f6a5d10 100644
--- a/sys/include/net/ieee802154/radio.h
+++ b/sys/include/net/ieee802154/radio.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ieee802154/submac.h b/sys/include/net/ieee802154/submac.h
index 6c340d459374..30824c6eb91a 100644
--- a/sys/include/net/ieee802154/submac.h
+++ b/sys/include/net/ieee802154/submac.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ieee802154_security.h b/sys/include/net/ieee802154_security.h
index 40e248bcd627..99f446f75a36 100644
--- a/sys/include/net/ieee802154_security.h
+++ b/sys/include/net/ieee802154_security.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/inet_csum.h b/sys/include/net/inet_csum.h
index fddb16475a07..f193a2f4d077 100644
--- a/sys/include/net/inet_csum.h
+++ b/sys/include/net/inet_csum.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv4.h b/sys/include/net/ipv4.h
index bcfbc2bd1866..701c86461991 100644
--- a/sys/include/net/ipv4.h
+++ b/sys/include/net/ipv4.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv4/addr.h b/sys/include/net/ipv4/addr.h
index f668f925d900..a55437ce5ca1 100644
--- a/sys/include/net/ipv4/addr.h
+++ b/sys/include/net/ipv4/addr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv4/hdr.h b/sys/include/net/ipv4/hdr.h
index fb432b16a219..21f8d6c8c92f 100644
--- a/sys/include/net/ipv4/hdr.h
+++ b/sys/include/net/ipv4/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 José Ignacio Alamos <jialamos@uc.cl>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 José Ignacio Alamos <jialamos@uc.cl>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6.h b/sys/include/net/ipv6.h
index d90b4fd97f97..76f5266818a3 100644
--- a/sys/include/net/ipv6.h
+++ b/sys/include/net/ipv6.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/addr.h b/sys/include/net/ipv6/addr.h
index 38048992e616..287077014550 100644
--- a/sys/include/net/ipv6/addr.h
+++ b/sys/include/net/ipv6/addr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/ext.h b/sys/include/net/ipv6/ext.h
index 4b47cb8fdecc..8a3f83bf1a89 100644
--- a/sys/include/net/ipv6/ext.h
+++ b/sys/include/net/ipv6/ext.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/ext/frag.h b/sys/include/net/ipv6/ext/frag.h
index e82b9d33da08..bddfd85da5a0 100644
--- a/sys/include/net/ipv6/ext/frag.h
+++ b/sys/include/net/ipv6/ext/frag.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/ext/opt.h b/sys/include/net/ipv6/ext/opt.h
index e8f26d8d2b60..a0c1fc2241bd 100644
--- a/sys/include/net/ipv6/ext/opt.h
+++ b/sys/include/net/ipv6/ext/opt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/ext/rh.h b/sys/include/net/ipv6/ext/rh.h
index 4577d2742292..0dfa7e45af2d 100644
--- a/sys/include/net/ipv6/ext/rh.h
+++ b/sys/include/net/ipv6/ext/rh.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ipv6/hdr.h b/sys/include/net/ipv6/hdr.h
index a626f0c626e7..b9f95a115022 100644
--- a/sys/include/net/ipv6/hdr.h
+++ b/sys/include/net/ipv6/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/l2filter.h b/sys/include/net/l2filter.h
index 11f999a90095..ba111783d933 100644
--- a/sys/include/net/l2filter.h
+++ b/sys/include/net/l2filter.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/l2scan_list.h b/sys/include/net/l2scan_list.h
index ef487b86ff80..76a6043e19da 100644
--- a/sys/include/net/l2scan_list.h
+++ b/sys/include/net/l2scan_list.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 ML!PA Consulting Gmbh
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 ML!PA Consulting Gmbh
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/l2util.h b/sys/include/net/l2util.h
index 900de3bf89e5..95679097d0be 100644
--- a/sys/include/net/l2util.h
+++ b/sys/include/net/l2util.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/lora.h b/sys/include/net/lora.h
index 706c422ff492..ab4588b082bb 100644
--- a/sys/include/net/lora.h
+++ b/sys/include/net/lora.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/loramac.h b/sys/include/net/loramac.h
index 738c05409849..237ee121c621 100644
--- a/sys/include/net/loramac.h
+++ b/sys/include/net/loramac.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/lorawan/hdr.h b/sys/include/net/lorawan/hdr.h
index 664f553b3fd7..f39176ab3bc9 100644
--- a/sys/include/net/lorawan/hdr.h
+++ b/sys/include/net/lorawan/hdr.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 Fundación Inria Chile
- * Copyright (C) 2019 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Fundación Inria Chile
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/mqttsn.h b/sys/include/net/mqttsn.h
index b55d963fb59b..6a39cf8d14f4 100644
--- a/sys/include/net/mqttsn.h
+++ b/sys/include/net/mqttsn.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap.h b/sys/include/net/nanocoap.h
index c7812cca1fd1..a20147abb3b4 100644
--- a/sys/include/net/nanocoap.h
+++ b/sys/include/net/nanocoap.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016-18 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Freie Universität Berlin
- *               2018 Inria
- *               2018 Ken Bannister <kb2ma@runbox.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016-2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Ken Bannister <kb2ma@runbox.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap/cache.h b/sys/include/net/nanocoap/cache.h
index 3141de306675..39488ec25522 100644
--- a/sys/include/net/nanocoap/cache.h
+++ b/sys/include/net/nanocoap/cache.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap/fileserver.h b/sys/include/net/nanocoap/fileserver.h
index b585a7817f68..8b4f16d5edd0 100644
--- a/sys/include/net/nanocoap/fileserver.h
+++ b/sys/include/net/nanocoap/fileserver.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 chrysn
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 chrysn
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap/fs.h b/sys/include/net/nanocoap/fs.h
index 54010e096997..89e727ff3a10 100644
--- a/sys/include/net/nanocoap/fs.h
+++ b/sys/include/net/nanocoap/fs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2024 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap/link_format.h b/sys/include/net/nanocoap/link_format.h
index 15f2fe52858f..35005a100273 100644
--- a/sys/include/net/nanocoap/link_format.h
+++ b/sys/include/net/nanocoap/link_format.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap_sock.h b/sys/include/net/nanocoap_sock.h
index 9c5717668816..4ce4bc970a7d 100644
--- a/sys/include/net/nanocoap_sock.h
+++ b/sys/include/net/nanocoap_sock.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Inria
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/nanocoap_vfs.h b/sys/include/net/nanocoap_vfs.h
index 8aa4184c7320..5e455b37552a 100644
--- a/sys/include/net/nanocoap_vfs.h
+++ b/sys/include/net/nanocoap_vfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ndp.h b/sys/include/net/ndp.h
index e6de0cae30cb..a4e833ff62b9 100644
--- a/sys/include/net/ndp.h
+++ b/sys/include/net/ndp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/netdev_test.h b/sys/include/net/netdev_test.h
index 74ae1380b9f7..0a98cc0723ee 100644
--- a/sys/include/net/netdev_test.h
+++ b/sys/include/net/netdev_test.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/netif.h b/sys/include/net/netif.h
index 858907e890d5..93a143843773 100644
--- a/sys/include/net/netif.h
+++ b/sys/include/net/netif.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/netopt.h b/sys/include/net/netopt.h
index 4fee30d67ae4..bc1a2114f983 100644
--- a/sys/include/net/netopt.h
+++ b/sys/include/net/netopt.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *               2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/netstats.h b/sys/include/net/netstats.h
index 83d2223c30a1..8a85320aaa00 100644
--- a/sys/include/net/netstats.h
+++ b/sys/include/net/netstats.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/netstats/neighbor.h b/sys/include/net/netstats/neighbor.h
index 201011e5de1a..d8093623b733 100644
--- a/sys/include/net/netstats/neighbor.h
+++ b/sys/include/net/netstats/neighbor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2017 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ntp_packet.h b/sys/include/net/ntp_packet.h
index 9bb0dc8dd816..b53270c3750a 100644
--- a/sys/include/net/ntp_packet.h
+++ b/sys/include/net/ntp_packet.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Luminița Lăzărescu <cluminita.lazarescu@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Luminița Lăzărescu <cluminita.lazarescu@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/packet.h b/sys/include/net/packet.h
index 4ba0f6c17e6e..beef6e054b41 100644
--- a/sys/include/net/packet.h
+++ b/sys/include/net/packet.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 INRIA
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 INRIA
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ppp/hdr.h b/sys/include/net/ppp/hdr.h
index bc28a02594d7..60e52f931c44 100644
--- a/sys/include/net/ppp/hdr.h
+++ b/sys/include/net/ppp/hdr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 José Ignacio Alamos <jialamos@uc.cl>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 José Ignacio Alamos <jialamos@uc.cl>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/ppptype.h b/sys/include/net/ppptype.h
index a6d57854c720..b8a38b5b4c72 100644
--- a/sys/include/net/ppptype.h
+++ b/sys/include/net/ppptype.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 José Ignacio Alamos
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2016 José Ignacio Alamos
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/protnum.h b/sys/include/net/protnum.h
index fce07e5fb5b9..d3fbe2de3643 100644
--- a/sys/include/net/protnum.h
+++ b/sys/include/net/protnum.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/rpl/rpl_netstats.h b/sys/include/net/rpl/rpl_netstats.h
index 41f288295451..9ad07af0a366 100644
--- a/sys/include/net/rpl/rpl_netstats.h
+++ b/sys/include/net/rpl/rpl_netstats.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sixlowpan.h b/sys/include/net/sixlowpan.h
index c86f9a772efe..278844ce3235 100644
--- a/sys/include/net/sixlowpan.h
+++ b/sys/include/net/sixlowpan.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sixlowpan/nd.h b/sys/include/net/sixlowpan/nd.h
index 4db6d3e1a659..47817eb8a14c 100644
--- a/sys/include/net/sixlowpan/nd.h
+++ b/sys/include/net/sixlowpan/nd.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sixlowpan/sfr.h b/sys/include/net/sixlowpan/sfr.h
index b06b96a5c92c..ef75278a2119 100644
--- a/sys/include/net/sixlowpan/sfr.h
+++ b/sys/include/net/sixlowpan/sfr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/skald.h b/sys/include/net/skald.h
index eecfae897ef0..826ec291a2f4 100644
--- a/sys/include/net/skald.h
+++ b/sys/include/net/skald.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/skald/eddystone.h b/sys/include/net/skald/eddystone.h
index d3d7976f89ae..b3108780966f 100644
--- a/sys/include/net/skald/eddystone.h
+++ b/sys/include/net/skald/eddystone.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/skald/ibeacon.h b/sys/include/net/skald/ibeacon.h
index a0b0848e9b11..19aa9510a373 100644
--- a/sys/include/net/skald/ibeacon.h
+++ b/sys/include/net/skald/ibeacon.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sntp.h b/sys/include/net/sntp.h
index e6fc1ce6bc08..f53c9bd358a7 100644
--- a/sys/include/net/sntp.h
+++ b/sys/include/net/sntp.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 Luminița Lăzărescu <cluminita.lazarescu@gmail.com>
- * Copyright (C) 2017 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Luminița Lăzărescu <cluminita.lazarescu@gmail.com>
+ * SPDX-FileCopyrightText: 2017 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock.h b/sys/include/net/sock.h
index df544d1def11..8667b8209150 100644
--- a/sys/include/net/sock.h
+++ b/sys/include/net/sock.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016 Alexander Aring <aar@pengutronix.de>
- *                    Freie Universität Berlin
- *                    HAW Hamburg
- *                    Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Alexander Aring <aar@pengutronix.de>
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/async.h b/sys/include/net/sock/async.h
index 193681122c8c..ac65e9c6f4fe 100644
--- a/sys/include/net/sock/async.h
+++ b/sys/include/net/sock/async.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/async/event.h b/sys/include/net/sock/async/event.h
index 352a6446eada..1cc936e1cc49 100644
--- a/sys/include/net/sock/async/event.h
+++ b/sys/include/net/sock/async/event.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/async/types.h b/sys/include/net/sock/async/types.h
index b1942bfff1f8..2f1f6fcda57f 100644
--- a/sys/include/net/sock/async/types.h
+++ b/sys/include/net/sock/async/types.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019-20 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019-2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/config.h b/sys/include/net/sock/config.h
index aa6fd323a761..0d3c15ff24a3 100644
--- a/sys/include/net/sock/config.h
+++ b/sys/include/net/sock/config.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/dns.h b/sys/include/net/sock/dns.h
index e0da7a9ef84c..c3d09b845854 100644
--- a/sys/include/net/sock/dns.h
+++ b/sys/include/net/sock/dns.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/dodtls.h b/sys/include/net/sock/dodtls.h
index 48362c67970d..1dcaeb0e42e3 100644
--- a/sys/include/net/sock/dodtls.h
+++ b/sys/include/net/sock/dodtls.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/dtls.h b/sys/include/net/sock/dtls.h
index b5cfe46d8e5c..24a6c2f8eecf 100644
--- a/sys/include/net/sock/dtls.h
+++ b/sys/include/net/sock/dtls.h
@@ -1,13 +1,10 @@
 /*
- * Copyright (C) 2019 HAW Hamburg
- *                    Freie Universität Berlin
- *                    Inria
- *                    Daniele Lacamera
- *                    Ken Bannister
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 HAW Hamburg
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-FileCopyrightText: 2019 Daniele Lacamera
+ * SPDX-FileCopyrightText: 2019 Ken Bannister
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/dtls/creds.h b/sys/include/net/sock/dtls/creds.h
index 593beb08e531..3d73b7587778 100644
--- a/sys/include/net/sock/dtls/creds.h
+++ b/sys/include/net/sock/dtls/creds.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/ip.h b/sys/include/net/sock/ip.h
index 48a512ce6239..c8cf152ae40b 100644
--- a/sys/include/net/sock/ip.h
+++ b/sys/include/net/sock/ip.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016 Alexander Aring <aar@pengutronix.de>
- *                    Freie Universität Berlin
- *                    HAW Hamburg
- *                    Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Alexander Aring <aar@pengutronix.de>
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/tcp.h b/sys/include/net/sock/tcp.h
index a964c7de0e4d..a3b22d9b50cb 100644
--- a/sys/include/net/sock/tcp.h
+++ b/sys/include/net/sock/tcp.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016 Alexander Aring <aar@pengutronix.de>
- *                    Freie Universität Berlin
- *                    HAW Hamburg
- *                    Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Alexander Aring <aar@pengutronix.de>
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/udp.h b/sys/include/net/sock/udp.h
index 9cc9e12247e4..9d15a585a2a0 100644
--- a/sys/include/net/sock/udp.h
+++ b/sys/include/net/sock/udp.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2016 Alexander Aring <aar@pengutronix.de>
- *                    Freie Universität Berlin
- *                    HAW Hamburg
- *                    Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Alexander Aring <aar@pengutronix.de>
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2016 HAW Hamburg
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/sock/util.h b/sys/include/net/sock/util.h
index 41266df7842b..d472092ae183 100644
--- a/sys/include/net/sock/util.h
+++ b/sys/include/net/sock/util.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/someip.h b/sys/include/net/someip.h
index 67920ebe8a1d..0db7547058cb 100644
--- a/sys/include/net/someip.h
+++ b/sys/include/net/someip.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/tcp.h b/sys/include/net/tcp.h
index 013311464525..b69fa4b94d50 100644
--- a/sys/include/net/tcp.h
+++ b/sys/include/net/tcp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015-2017 Simon Brummer
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015-2017 Simon Brummer
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/telnet.h b/sys/include/net/telnet.h
index 353b2a60541f..3d5c933d9664 100644
--- a/sys/include/net/telnet.h
+++ b/sys/include/net/telnet.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/udp.h b/sys/include/net/udp.h
index 968b2a54e06d..668361fbb887 100644
--- a/sys/include/net/udp.h
+++ b/sys/include/net/udp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/uhcp.h b/sys/include/net/uhcp.h
index 49ec919747f7..6fc0fa470ac6 100644
--- a/sys/include/net/uhcp.h
+++ b/sys/include/net/uhcp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap.h b/sys/include/net/unicoap.h
index 3f63ebd229d7..77fdf04f29c0 100644
--- a/sys/include/net/unicoap.h
+++ b/sys/include/net/unicoap.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap/config.h b/sys/include/net/unicoap/config.h
index f25eb077f028..b8ab11bf3e9c 100644
--- a/sys/include/net/unicoap/config.h
+++ b/sys/include/net/unicoap/config.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap/constants.h b/sys/include/net/unicoap/constants.h
index 3663cfc61dba..57bf18bffeb6 100644
--- a/sys/include/net/unicoap/constants.h
+++ b/sys/include/net/unicoap/constants.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- * Copyright (C) 2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap/message.h b/sys/include/net/unicoap/message.h
index 7c9901fa4f83..8a360507aecc 100644
--- a/sys/include/net/unicoap/message.h
+++ b/sys/include/net/unicoap/message.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap/options.h b/sys/include/net/unicoap/options.h
index 316b18926dfe..3a674d881e81 100644
--- a/sys/include/net/unicoap/options.h
+++ b/sys/include/net/unicoap/options.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/unicoap/util_macros.h b/sys/include/net/unicoap/util_macros.h
index cfe9917f32ac..11ee007fc74a 100644
--- a/sys/include/net/unicoap/util_macros.h
+++ b/sys/include/net/unicoap/util_macros.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024-2025 Carl Seifert
- * Copyright (C) 2024-2025 TU Dresden
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2024-2025 Carl Seifert
+ * SPDX-FileCopyrightText: 2024-2025 TU Dresden
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/utils.h b/sys/include/net/utils.h
index 926381815396..87e950f41399 100644
--- a/sys/include/net/utils.h
+++ b/sys/include/net/utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/wifi.h b/sys/include/net/wifi.h
index b88426f8135f..76eaf20e0794 100644
--- a/sys/include/net/wifi.h
+++ b/sys/include/net/wifi.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 Fabian Hüßler ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2023 Fabian Hüßler ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/wifi_scan_list.h b/sys/include/net/wifi_scan_list.h
index 641277072e55..b6921e0c521c 100644
--- a/sys/include/net/wifi_scan_list.h
+++ b/sys/include/net/wifi_scan_list.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/net/zep.h b/sys/include/net/zep.h
index 4cb427dfc9e6..5742693e098b 100644
--- a/sys/include/net/zep.h
+++ b/sys/include/net/zep.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/od.h b/sys/include/od.h
index 6b67308a5fe2..e34c53049715 100644
--- a/sys/include/od.h
+++ b/sys/include/od.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/phydat.h b/sys/include/phydat.h
index 166a95b7ca01..47aa2db07f3e 100644
--- a/sys/include/phydat.h
+++ b/sys/include/phydat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/pipe.h b/sys/include/pipe.h
index e016e5f40e3d..321477db45c9 100644
--- a/sys/include/pipe.h
+++ b/sys/include/pipe.h
@@ -1,19 +1,6 @@
 /*
- * Copyright (C) 2014  René Kijewski  <rene.kijewski@fu-berlin.de>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * SPDX-FileCopyrightText: 2014 René Kijewski <rene.kijewski@fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #pragma once
diff --git a/sys/include/pm_layered.h b/sys/include/pm_layered.h
index a8e27e5872fb..746a74d30b34 100644
--- a/sys/include/pm_layered.h
+++ b/sys/include/pm_layered.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/progress_bar.h b/sys/include/progress_bar.h
index de6d33250759..7561c1c40c21 100644
--- a/sys/include/progress_bar.h
+++ b/sys/include/progress_bar.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ps.h b/sys/include/ps.h
index 72983d947fb4..e502db5292e6 100644
--- a/sys/include/ps.h
+++ b/sys/include/ps.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2010 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2010 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/aead/algorithm.h b/sys/include/psa_crypto/psa/aead/algorithm.h
index 98dfde993c35..03880782fdff 100644
--- a/sys/include/psa_crypto/psa/aead/algorithm.h
+++ b/sys/include/psa_crypto/psa/aead/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/aead/sizes.h b/sys/include/psa_crypto/psa/aead/sizes.h
index 7229af1e1231..faa4b95acb1c 100644
--- a/sys/include/psa_crypto/psa/aead/sizes.h
+++ b/sys/include/psa_crypto/psa/aead/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/aead/types.h b/sys/include/psa_crypto/psa/aead/types.h
index 21b2c2f8ec96..f7b7a2669986 100644
--- a/sys/include/psa_crypto/psa/aead/types.h
+++ b/sys/include/psa_crypto/psa/aead/types.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/algorithm.h b/sys/include/psa_crypto/psa/algorithm.h
index 87456850fe1b..5a768cbb6548 100644
--- a/sys/include/psa_crypto/psa/algorithm.h
+++ b/sys/include/psa_crypto/psa/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/asymmetric_encryption/algorithm.h b/sys/include/psa_crypto/psa/asymmetric_encryption/algorithm.h
index 8d8e1f799855..bd36857db0da 100644
--- a/sys/include/psa_crypto/psa/asymmetric_encryption/algorithm.h
+++ b/sys/include/psa_crypto/psa/asymmetric_encryption/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/asymmetric_encryption/sizes.h b/sys/include/psa_crypto/psa/asymmetric_encryption/sizes.h
index 834b809af657..a6972001467a 100644
--- a/sys/include/psa_crypto/psa/asymmetric_encryption/sizes.h
+++ b/sys/include/psa_crypto/psa/asymmetric_encryption/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/asymmetric_signature/algorithm.h b/sys/include/psa_crypto/psa/asymmetric_signature/algorithm.h
index 5e3201cd23f7..af5865597e7e 100644
--- a/sys/include/psa_crypto/psa/asymmetric_signature/algorithm.h
+++ b/sys/include/psa_crypto/psa/asymmetric_signature/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/asymmetric_signature/sizes.h b/sys/include/psa_crypto/psa/asymmetric_signature/sizes.h
index 75b17329903c..f4689a01671b 100644
--- a/sys/include/psa_crypto/psa/asymmetric_signature/sizes.h
+++ b/sys/include/psa_crypto/psa/asymmetric_signature/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/cipher/algorithm.h b/sys/include/psa_crypto/psa/cipher/algorithm.h
index 754a1d8325a7..f6b944642c26 100644
--- a/sys/include/psa_crypto/psa/cipher/algorithm.h
+++ b/sys/include/psa_crypto/psa/cipher/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/cipher/sizes.h b/sys/include/psa_crypto/psa/cipher/sizes.h
index e8572b0abf72..fa34e8542dd2 100644
--- a/sys/include/psa_crypto/psa/cipher/sizes.h
+++ b/sys/include/psa_crypto/psa/cipher/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/cipher/types.h b/sys/include/psa_crypto/psa/cipher/types.h
index 26ff35e182a9..def7cb274308 100644
--- a/sys/include/psa_crypto/psa/cipher/types.h
+++ b/sys/include/psa_crypto/psa/cipher/types.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto.h b/sys/include/psa_crypto/psa/crypto.h
index 78ecdc0ec2dd..39af3bc0c3a8 100644
--- a/sys/include/psa_crypto/psa/crypto.h
+++ b/sys/include/psa_crypto/psa/crypto.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_contexts.h b/sys/include/psa_crypto/psa/crypto_contexts.h
index ec19362b760f..42c8e3f03761 100644
--- a/sys/include/psa_crypto/psa/crypto_contexts.h
+++ b/sys/include/psa_crypto/psa/crypto_contexts.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_includes.h b/sys/include/psa_crypto/psa/crypto_includes.h
index 9c19cdd2ae8b..1ebc7b768ff3 100644
--- a/sys/include/psa_crypto/psa/crypto_includes.h
+++ b/sys/include/psa_crypto/psa/crypto_includes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_se_config.h b/sys/include/psa_crypto/psa/crypto_se_config.h
index 78e8ad04b3a6..8e81b3980276 100644
--- a/sys/include/psa_crypto/psa/crypto_se_config.h
+++ b/sys/include/psa_crypto/psa/crypto_se_config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_sizes.h b/sys/include/psa_crypto/psa/crypto_sizes.h
index 7b76ca666b72..f0e4c0a702a7 100644
--- a/sys/include/psa_crypto/psa/crypto_sizes.h
+++ b/sys/include/psa_crypto/psa/crypto_sizes.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_struct.h b/sys/include/psa_crypto/psa/crypto_struct.h
index 8d44a80a6d7c..4ddeefa0c0a9 100644
--- a/sys/include/psa_crypto/psa/crypto_struct.h
+++ b/sys/include/psa_crypto/psa/crypto_struct.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_types.h b/sys/include/psa_crypto/psa/crypto_types.h
index 1d147423b17c..70eb84afe863 100644
--- a/sys/include/psa_crypto/psa/crypto_types.h
+++ b/sys/include/psa_crypto/psa/crypto_types.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/crypto_values.h b/sys/include/psa_crypto/psa/crypto_values.h
index c124e7d2169e..b5c1a076f9d5 100644
--- a/sys/include/psa_crypto/psa/crypto_values.h
+++ b/sys/include/psa_crypto/psa/crypto_values.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/error.h b/sys/include/psa_crypto/psa/error.h
index e1d52d6b8d42..f45bf176c0da 100644
--- a/sys/include/psa_crypto/psa/error.h
+++ b/sys/include/psa_crypto/psa/error.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/hash/algorithm.h b/sys/include/psa_crypto/psa/hash/algorithm.h
index beb7a61d4193..20a833e6c8bc 100644
--- a/sys/include/psa_crypto/psa/hash/algorithm.h
+++ b/sys/include/psa_crypto/psa/hash/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/hash/sizes.h b/sys/include/psa_crypto/psa/hash/sizes.h
index 2c36ad515500..9f9da840839a 100644
--- a/sys/include/psa_crypto/psa/hash/sizes.h
+++ b/sys/include/psa_crypto/psa/hash/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/hash/types.h b/sys/include/psa_crypto/psa/hash/types.h
index d38af5f59e52..0fabc171d5c8 100644
--- a/sys/include/psa_crypto/psa/hash/types.h
+++ b/sys/include/psa_crypto/psa/hash/types.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/attributes.h b/sys/include/psa_crypto/psa/key/attributes.h
index 7c3a40598e4e..0d6412271087 100644
--- a/sys/include/psa_crypto/psa/key/attributes.h
+++ b/sys/include/psa_crypto/psa/key/attributes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/bits.h b/sys/include/psa_crypto/psa/key/bits.h
index aa3d1adc6d91..d9ba1df06fd3 100644
--- a/sys/include/psa_crypto/psa/key/bits.h
+++ b/sys/include/psa_crypto/psa/key/bits.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/id.h b/sys/include/psa_crypto/psa/key/id.h
index 44507e619360..d13e3f8788e2 100644
--- a/sys/include/psa_crypto/psa/key/id.h
+++ b/sys/include/psa_crypto/psa/key/id.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/lifetime.h b/sys/include/psa_crypto/psa/key/lifetime.h
index 5210038d1e5c..343b6b2f9396 100644
--- a/sys/include/psa_crypto/psa/key/lifetime.h
+++ b/sys/include/psa_crypto/psa/key/lifetime.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/sizes.h b/sys/include/psa_crypto/psa/key/sizes.h
index ae3f30888d45..284076f4c306 100644
--- a/sys/include/psa_crypto/psa/key/sizes.h
+++ b/sys/include/psa_crypto/psa/key/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/type.h b/sys/include/psa_crypto/psa/key/type.h
index f129392f6357..f77507ca421b 100644
--- a/sys/include/psa_crypto/psa/key/type.h
+++ b/sys/include/psa_crypto/psa/key/type.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/usage.h b/sys/include/psa_crypto/psa/key/usage.h
index 63f8734c12ab..0898b0aded43 100644
--- a/sys/include/psa_crypto/psa/key/usage.h
+++ b/sys/include/psa_crypto/psa/key/usage.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key/values.h b/sys/include/psa_crypto/psa/key/values.h
index a20a449b04be..1e3ec17d0cbd 100644
--- a/sys/include/psa_crypto/psa/key/values.h
+++ b/sys/include/psa_crypto/psa/key/values.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_agreement/algorithm.h b/sys/include/psa_crypto/psa/key_agreement/algorithm.h
index 0d947c36fa73..d7c7038c3da4 100644
--- a/sys/include/psa_crypto/psa/key_agreement/algorithm.h
+++ b/sys/include/psa_crypto/psa/key_agreement/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_agreement/sizes.h b/sys/include/psa_crypto/psa/key_agreement/sizes.h
index 2036e3d8da3c..48fb1f92e584 100644
--- a/sys/include/psa_crypto/psa/key_agreement/sizes.h
+++ b/sys/include/psa_crypto/psa/key_agreement/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_derivation/algorithm.h b/sys/include/psa_crypto/psa/key_derivation/algorithm.h
index f2ff7fb7060a..22a7e9da2a56 100644
--- a/sys/include/psa_crypto/psa/key_derivation/algorithm.h
+++ b/sys/include/psa_crypto/psa/key_derivation/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_derivation/sizes.h b/sys/include/psa_crypto/psa/key_derivation/sizes.h
index b51ab140274d..aa3f636127f3 100644
--- a/sys/include/psa_crypto/psa/key_derivation/sizes.h
+++ b/sys/include/psa_crypto/psa/key_derivation/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_derivation/types.h b/sys/include/psa_crypto/psa/key_derivation/types.h
index 5b43b7f6df9d..88c095ab6f96 100644
--- a/sys/include/psa_crypto/psa/key_derivation/types.h
+++ b/sys/include/psa_crypto/psa/key_derivation/types.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/key_derivation/values.h b/sys/include/psa_crypto/psa/key_derivation/values.h
index c7103623ac07..e3d98803b56c 100644
--- a/sys/include/psa_crypto/psa/key_derivation/values.h
+++ b/sys/include/psa_crypto/psa/key_derivation/values.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/mac/algorithm.h b/sys/include/psa_crypto/psa/mac/algorithm.h
index 02492751867a..49b8d6a08ed8 100644
--- a/sys/include/psa_crypto/psa/mac/algorithm.h
+++ b/sys/include/psa_crypto/psa/mac/algorithm.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2024 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2024 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/mac/sizes.h b/sys/include/psa_crypto/psa/mac/sizes.h
index 3e817b29ecda..c1f9e9a34d81 100644
--- a/sys/include/psa_crypto/psa/mac/sizes.h
+++ b/sys/include/psa_crypto/psa/mac/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/mac/types.h b/sys/include/psa_crypto/psa/mac/types.h
index befdae880c94..aeb352bf01d1 100644
--- a/sys/include/psa_crypto/psa/mac/types.h
+++ b/sys/include/psa_crypto/psa/mac/types.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/psa_crypto/psa/sizes.h b/sys/include/psa_crypto/psa/sizes.h
index 57e9b3de5a34..9e4868c06159 100644
--- a/sys/include/psa_crypto/psa/sizes.h
+++ b/sys/include/psa_crypto/psa/sizes.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2025 TU Dresden
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2025 TU Dresden
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ptrtag.h b/sys/include/ptrtag.h
index 62ced9870669..90fa7361c5e9 100644
--- a/sys/include/ptrtag.h
+++ b/sys/include/ptrtag.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/puf_sram.h b/sys/include/puf_sram.h
index bec0d9966507..1c52b1200715 100644
--- a/sys/include/puf_sram.h
+++ b/sys/include/puf_sram.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/random.h b/sys/include/random.h
index 5371648bafca..74fa21d096ca 100644
--- a/sys/include/random.h
+++ b/sys/include/random.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2013 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/bootloader_selection.h b/sys/include/riotboot/bootloader_selection.h
index 836acbd260ba..74bc74c2d48b 100644
--- a/sys/include/riotboot/bootloader_selection.h
+++ b/sys/include/riotboot/bootloader_selection.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Christian Amsüss <chrysn@fsfe.org>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Christian Amsüss <chrysn@fsfe.org>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/flashwrite.h b/sys/include/riotboot/flashwrite.h
index b9a63a558ae8..e8b1806ae529 100644
--- a/sys/include/riotboot/flashwrite.h
+++ b/sys/include/riotboot/flashwrite.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Inria
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/hdr.h b/sys/include/riotboot/hdr.h
index 1633ac215a0f..43910149d8c0 100644
--- a/sys/include/riotboot/hdr.h
+++ b/sys/include/riotboot/hdr.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Inria
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/magic.h b/sys/include/riotboot/magic.h
index 547e2e09a3ab..d4965ddd1917 100644
--- a/sys/include/riotboot/magic.h
+++ b/sys/include/riotboot/magic.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/serial.h b/sys/include/riotboot/serial.h
index 7037b99ce838..259ada25b684 100644
--- a/sys/include/riotboot/serial.h
+++ b/sys/include/riotboot/serial.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Benjamin Valentin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Benjamin Valentin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/slot.h b/sys/include/riotboot/slot.h
index 2f0ff116c7dd..29004803f73c 100644
--- a/sys/include/riotboot/slot.h
+++ b/sys/include/riotboot/slot.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Inria
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/riotboot/usb_dfu.h b/sys/include/riotboot/usb_dfu.h
index bdf122f8ac49..6449a1b7eae2 100644
--- a/sys/include/riotboot/usb_dfu.h
+++ b/sys/include/riotboot/usb_dfu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/rtc_utils.h b/sys/include/rtc_utils.h
index 12e9f252ae3c..18512905f272 100644
--- a/sys/include/rtc_utils.h
+++ b/sys/include/rtc_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/saul_reg.h b/sys/include/saul_reg.h
index 87e46bda3828..bb4c3fcabdeb 100644
--- a/sys/include/saul_reg.h
+++ b/sys/include/saul_reg.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/sched_round_robin.h b/sys/include/sched_round_robin.h
index 0fc81e00b418..ab7fbf7eaa91 100644
--- a/sys/include/sched_round_robin.h
+++ b/sys/include/sched_round_robin.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 TUBA Freiberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 TUBA Freiberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/schedstatistics.h b/sys/include/schedstatistics.h
index 2d44aff1a96e..274e88953dea 100644
--- a/sys/include/schedstatistics.h
+++ b/sys/include/schedstatistics.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2014 Freie Universität Berlin
- *               2019 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/sema.h b/sys/include/sema.h
index 216991902ce5..c262866d8931 100644
--- a/sys/include/sema.h
+++ b/sys/include/sema.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 TriaGnoSys GmbH
- *               2015 Martine Lenders <mlenders@inf.fu-berlin.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 TriaGnoSys GmbH
+ * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/sema_inv.h b/sys/include/sema_inv.h
index 09631452d594..7cb1512af18e 100644
--- a/sys/include/sema_inv.h
+++ b/sys/include/sema_inv.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/senml.h b/sys/include/senml.h
index 2f0abda8cc8c..82025e727a73 100644
--- a/sys/include/senml.h
+++ b/sys/include/senml.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Silke Hofstra
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Silke Hofstra
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/senml/cbor.h b/sys/include/senml/cbor.h
index be542981b62a..75072073a674 100644
--- a/sys/include/senml/cbor.h
+++ b/sys/include/senml/cbor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Silke Hofstra
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Silke Hofstra
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/senml/phydat.h b/sys/include/senml/phydat.h
index d90ab9ef4bd7..ef45494b5a74 100644
--- a/sys/include/senml/phydat.h
+++ b/sys/include/senml/phydat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Silke Hofstra
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Silke Hofstra
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/senml/saul.h b/sys/include/senml/saul.h
index 6eaeeeaec48b..6b4e9d27c60f 100644
--- a/sys/include/senml/saul.h
+++ b/sys/include/senml/saul.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Silke Hofstra
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Silke Hofstra
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/seq.h b/sys/include/seq.h
index df5a8ac91f86..19588802a842 100644
--- a/sys/include/seq.h
+++ b/sys/include/seq.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/shell.h b/sys/include/shell.h
index 2230fe7c942d..8f4c524f1d90 100644
--- a/sys/include/shell.h
+++ b/sys/include/shell.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2009-2013 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2009-2013 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/shell_lock.h b/sys/include/shell_lock.h
index 1532897b5d12..3bc9da71315c 100644
--- a/sys/include/shell_lock.h
+++ b/sys/include/shell_lock.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/stdio_base.h b/sys/include/stdio_base.h
index 86d1126a8582..a6da636b28af 100644
--- a/sys/include/stdio_base.h
+++ b/sys/include/stdio_base.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/stdio_nimble.h b/sys/include/stdio_nimble.h
index 741498ee1a7c..aef5e65b7848 100644
--- a/sys/include/stdio_nimble.h
+++ b/sys/include/stdio_nimble.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/stdio_rtt.h b/sys/include/stdio_rtt.h
index 3d33dbc1422a..32a07f3e2087 100644
--- a/sys/include/stdio_rtt.h
+++ b/sys/include/stdio_rtt.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2016 Michael Andersen <m.andersen@berkeley.edu>
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Michael Andersen <m.andersen@berkeley.edu>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/stdio_semihosting.h b/sys/include/stdio_semihosting.h
index bf7b3caadac4..83d86c12f346 100644
--- a/sys/include/stdio_semihosting.h
+++ b/sys/include/stdio_semihosting.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/stdio_uart.h b/sys/include/stdio_uart.h
index 30ec9d6fb889..602f19f19026 100644
--- a/sys/include/stdio_uart.h
+++ b/sys/include/stdio_uart.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/string_utils.h b/sys/include/string_utils.h
index c568389c515e..e229c619ceb9 100644
--- a/sys/include/string_utils.h
+++ b/sys/include/string_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2022 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit.h b/sys/include/suit.h
index 77cf10ba45a5..6d627016ec36 100644
--- a/sys/include/suit.h
+++ b/sys/include/suit.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *               2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/conditions.h b/sys/include/suit/conditions.h
index 4736cccb58b1..77d472f9a950 100644
--- a/sys/include/suit/conditions.h
+++ b/sys/include/suit/conditions.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *               2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/handlers.h b/sys/include/suit/handlers.h
index 2399f4945b3d..1b6955067210 100644
--- a/sys/include/suit/handlers.h
+++ b/sys/include/suit/handlers.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *               2019 Kaspar Schleiser <kaspar@schleiser.de>
- *               2019 Inria
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/policy.h b/sys/include/suit/policy.h
index 8cc12f3b59ae..1c784de2b652 100644
--- a/sys/include/suit/policy.h
+++ b/sys/include/suit/policy.h
@@ -1,12 +1,9 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *               2019 Kaspar Schleiser <kaspar@schleiser.de>
- *               2019 Inria
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/storage.h b/sys/include/suit/storage.h
index 9e40a9da1cdc..0f9bed8a0fd3 100644
--- a/sys/include/suit/storage.h
+++ b/sys/include/suit/storage.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2020 Koen Zandberg
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/storage/flashwrite.h b/sys/include/suit/storage/flashwrite.h
index 928c67f7b385..c0158a440b90 100644
--- a/sys/include/suit/storage/flashwrite.h
+++ b/sys/include/suit/storage/flashwrite.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2020 Koen Zandberg
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/storage/ram.h b/sys/include/suit/storage/ram.h
index b93b988c8a05..f35e35fc77ae 100644
--- a/sys/include/suit/storage/ram.h
+++ b/sys/include/suit/storage/ram.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2020 Koen Zandberg
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/storage/vfs.h b/sys/include/suit/storage/vfs.h
index ee252450aedf..d2161e9d33d7 100644
--- a/sys/include/suit/storage/vfs.h
+++ b/sys/include/suit/storage/vfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/transport/coap.h b/sys/include/suit/transport/coap.h
index 8172b93ec9d4..3ada79e8b271 100644
--- a/sys/include/suit/transport/coap.h
+++ b/sys/include/suit/transport/coap.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *               2019 Inria
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/transport/mock.h b/sys/include/suit/transport/mock.h
index 636a5787360e..b1541f093b23 100644
--- a/sys/include/suit/transport/mock.h
+++ b/sys/include/suit/transport/mock.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2020 Koen Zandberg
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Koen Zandberg
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/transport/vfs.h b/sys/include/suit/transport/vfs.h
index d307aee23938..f5f132635771 100644
--- a/sys/include/suit/transport/vfs.h
+++ b/sys/include/suit/transport/vfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/suit/transport/worker.h b/sys/include/suit/transport/worker.h
index fa9157270cc6..df6e2a3e6c4d 100644
--- a/sys/include/suit/transport/worker.h
+++ b/sys/include/suit/transport/worker.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *               2019 Inria
- *               2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2019 Inria
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/sys/bus.h b/sys/include/sys/bus.h
index 14aa8fa11495..628e2c4590c6 100644
--- a/sys/include/sys/bus.h
+++ b/sys/include/sys/bus.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/benchmark_udp.h b/sys/include/test_utils/benchmark_udp.h
index 28b51c92d7a3..6a1646a3fe14 100644
--- a/sys/include/test_utils/benchmark_udp.h
+++ b/sys/include/test_utils/benchmark_udp.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/expect.h b/sys/include/test_utils/expect.h
index 5356b8cb669b..3f6131ba11ad 100644
--- a/sys/include/test_utils/expect.h
+++ b/sys/include/test_utils/expect.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2015 INRIA
- * Copyright (C) 2016 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2015 INRIA
+ * SPDX-FileCopyrightText: 2016 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/interactive_sync.h b/sys/include/test_utils/interactive_sync.h
index f2e2f9ee2684..43004e0ee73f 100644
--- a/sys/include/test_utils/interactive_sync.h
+++ b/sys/include/test_utils/interactive_sync.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/netdev_eth_minimal.h b/sys/include/test_utils/netdev_eth_minimal.h
index 8401ece79f5d..16f96227aef0 100644
--- a/sys/include/test_utils/netdev_eth_minimal.h
+++ b/sys/include/test_utils/netdev_eth_minimal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/netdev_ieee802154_minimal.h b/sys/include/test_utils/netdev_ieee802154_minimal.h
index 69eccc96eee7..7b7ee5dd9611 100644
--- a/sys/include/test_utils/netdev_ieee802154_minimal.h
+++ b/sys/include/test_utils/netdev_ieee802154_minimal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/test_utils/result_output.h b/sys/include/test_utils/result_output.h
index 813e9439ac57..ffb9ce21c46e 100644
--- a/sys/include/test_utils/result_output.h
+++ b/sys/include/test_utils/result_output.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/time_units.h b/sys/include/time_units.h
index 1232344f455a..97435b5ed76b 100644
--- a/sys/include/time_units.h
+++ b/sys/include/time_units.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2021 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2014 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2014 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/timex.h b/sys/include/timex.h
index 297825878932..e47362699c08 100644
--- a/sys/include/timex.h
+++ b/sys/include/timex.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2010 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2014 Oliver Hahm <oliver.hahm@inria.fr>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2010 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2014 Oliver Hahm <oliver.hahm@inria.fr>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/tiny_strerror.h b/sys/include/tiny_strerror.h
index 0c8547e183b8..081582387f4f 100644
--- a/sys/include/tiny_strerror.h
+++ b/sys/include/tiny_strerror.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *               2022 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-FileCopyrightText: 2022 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/tm.h b/sys/include/tm.h
index b77d8877bd1a..ef9801714cc3 100644
--- a/sys/include/tm.h
+++ b/sys/include/tm.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014 René Kijewski
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 René Kijewski
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/trace.h b/sys/include/trace.h
index 534468343cd9..02710fe9ada0 100644
--- a/sys/include/trace.h
+++ b/sys/include/trace.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
- *                    Freie Universität Berlin
- *                    Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/trickle.h b/sys/include/trickle.h
index 724ef3d2ce83..fa6e5c227f1b 100644
--- a/sys/include/trickle.h
+++ b/sys/include/trickle.h
@@ -1,12 +1,7 @@
 /*
- * Trickle constants and prototypes
- *
- * Copyright (C) 2013, 2014  INRIA.
- *               2017 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2013-2014 INRIA
+ * SPDX-FileCopyrightText: 2017 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/tsrb.h b/sys/include/tsrb.h
index 45c472411545..43fe4ba4715d 100644
--- a/sys/include/tsrb.h
+++ b/sys/include/tsrb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/unaligned.h b/sys/include/unaligned.h
index b81229a82c3f..e971fcc6709e 100644
--- a/sys/include/unaligned.h
+++ b/sys/include/unaligned.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/universal_address.h b/sys/include/universal_address.h
index 1567e24fe3f9..448cc9e0ea6e 100644
--- a/sys/include/universal_address.h
+++ b/sys/include/universal_address.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2014  Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2014 Martin Landsmann <Martin.Landsmann@HAW-Hamburg.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/uri_parser.h b/sys/include/uri_parser.h
index 2e7ca243ceec..6bfa075bac18 100644
--- a/sys/include/uri_parser.h
+++ b/sys/include/uri_parser.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 HAW Hamburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 HAW Hamburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb.h b/sys/include/usb.h
index 03f64dbb3273..905519a3c450 100644
--- a/sys/include/usb.h
+++ b/sys/include/usb.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/cdc.h b/sys/include/usb/cdc.h
index 800530f2a244..f4d345f5e77a 100644
--- a/sys/include/usb/cdc.h
+++ b/sys/include/usb/cdc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Dylan Laduranty <dylan.laduranty@mesotic.com>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2018 Dylan Laduranty <dylan.laduranty@mesotic.com>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/descriptor.h b/sys/include/usb/descriptor.h
index b5cab684ef76..8d925663472f 100644
--- a/sys/include/usb/descriptor.h
+++ b/sys/include/usb/descriptor.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/dfu.h b/sys/include/usb/dfu.h
index 7766f6e7ef8e..e09db9874f07 100644
--- a/sys/include/usb/dfu.h
+++ b/sys/include/usb/dfu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2020 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/hid.h b/sys/include/usb/hid.h
index d15031f9e4e2..4bf79e9181bf 100644
--- a/sys/include/usb/hid.h
+++ b/sys/include/usb/hid.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Nils Ollrogge
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2021 Nils Ollrogge
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/hid/hid_usage.h b/sys/include/usb/hid/hid_usage.h
index 3f25ff4d0960..d16cdc97ccd6 100644
--- a/sys/include/usb/hid/hid_usage.h
+++ b/sys/include/usb/hid/hid_usage.h
@@ -1,9 +1,6 @@
 /*
- * Copyright C 2021 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2021 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/msc.h b/sys/include/usb/msc.h
index 90f6f6c0e2a0..13e9e0867262 100644
--- a/sys/include/usb/msc.h
+++ b/sys/include/usb/msc.h
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019-2021 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
- *
- *
+ * SPDX-FileCopyrightText: 2019-2021 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbopt.h b/sys/include/usb/usbopt.h
index 0e836fc7ef46..8e5c044efe9a 100644
--- a/sys/include/usb/usbopt.h
+++ b/sys/include/usb/usbopt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg <koen@bergzand.net>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg <koen@bergzand.net>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus.h b/sys/include/usb/usbus.h
index fbe8cce308ae..8b9d9daa92f7 100644
--- a/sys/include/usb/usbus.h
+++ b/sys/include/usb/usbus.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/cdc/acm.h b/sys/include/usb/usbus/cdc/acm.h
index c558fecf5460..3abc16a1503d 100644
--- a/sys/include/usb/usbus/cdc/acm.h
+++ b/sys/include/usb/usbus/cdc/acm.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2018 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/cdc/ecm.h b/sys/include/usb/usbus/cdc/ecm.h
index 9a6eb115fd8e..1789d593deb7 100644
--- a/sys/include/usb/usbus/cdc/ecm.h
+++ b/sys/include/usb/usbus/cdc/ecm.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/control.h b/sys/include/usb/usbus/control.h
index e53610d43594..48ac3a3d10a9 100644
--- a/sys/include/usb/usbus/control.h
+++ b/sys/include/usb/usbus/control.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/dfu.h b/sys/include/usb/usbus/dfu.h
index 138fba920f0a..08ee8a80e098 100644
--- a/sys/include/usb/usbus/dfu.h
+++ b/sys/include/usb/usbus/dfu.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2020 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/fmt.h b/sys/include/usb/usbus/fmt.h
index f881c5107f00..6736598b4a3f 100644
--- a/sys/include/usb/usbus/fmt.h
+++ b/sys/include/usb/usbus/fmt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Koen Zandberg
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Koen Zandberg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/hid.h b/sys/include/usb/usbus/hid.h
index a0725af52a8d..7ffaa9b75ca2 100644
--- a/sys/include/usb/usbus/hid.h
+++ b/sys/include/usb/usbus/hid.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Nils Ollrogge
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2021 Nils Ollrogge
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/hid_io.h b/sys/include/usb/usbus/hid_io.h
index 42d784f03eef..06d60f95e845 100644
--- a/sys/include/usb/usbus/hid_io.h
+++ b/sys/include/usb/usbus/hid_io.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Nils Ollrogge
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2021 Nils Ollrogge
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/msc.h b/sys/include/usb/usbus/msc.h
index 9b8e5ab5daa1..18e4ae3fa798 100644
--- a/sys/include/usb/usbus/msc.h
+++ b/sys/include/usb/usbus/msc.h
@@ -1,11 +1,6 @@
 /*
- * Copyright (C) 2019-2021 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
- *
- *
+ * SPDX-FileCopyrightText: 2019-2021 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb/usbus/msc/scsi.h b/sys/include/usb/usbus/msc/scsi.h
index 253d16af38c2..d420e823d025 100644
--- a/sys/include/usb/usbus/msc/scsi.h
+++ b/sys/include/usb/usbus/msc/scsi.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019-2021 Mesotic SAS
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for
- * more details.
+ * SPDX-FileCopyrightText: 2019-2021 Mesotic SAS
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb_board_reset.h b/sys/include/usb_board_reset.h
index 1f2aca29b510..3bcaae8d8b6d 100644
--- a/sys/include/usb_board_reset.h
+++ b/sys/include/usb_board_reset.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/usb_board_reset_internal.h b/sys/include/usb_board_reset_internal.h
index d3bb163b7661..647a8b164e15 100644
--- a/sys/include/usb_board_reset_internal.h
+++ b/sys/include/usb_board_reset_internal.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ut_process.h b/sys/include/ut_process.h
index 4d0e24b3f76f..5a7df1f7097f 100644
--- a/sys/include/ut_process.h
+++ b/sys/include/ut_process.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 Freie Universität Berlin
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/utlist.h b/sys/include/utlist.h
index a38653f5bcbe..fdac4c77ad32 100644
--- a/sys/include/utlist.h
+++ b/sys/include/utlist.h
@@ -1,25 +1,7 @@
 /*
-Copyright (c) 2007-2014, Troy D. Hanson   http://troydhanson.github.com/uthash/
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+ * SPDX-FileCopyrightText: 2007-2014 Troy D. Hanson   http://troydhanson.github.com/uthash/
+ * SPDX-License-Identifier: BSD-1-Clause
+ */
 
 #pragma once
 
diff --git a/sys/include/uuid.h b/sys/include/uuid.h
index c81accc2b347..2c3cb5091670 100644
--- a/sys/include/uuid.h
+++ b/sys/include/uuid.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Freie Universität Berlin
- * Copyright (C) 2018 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2018 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/vfs.h b/sys/include/vfs.h
index 4204081a7c19..82fccd890b42 100644
--- a/sys/include/vfs.h
+++ b/sys/include/vfs.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/vfs_default.h b/sys/include/vfs_default.h
index 95963fc82c0d..12389697bebd 100644
--- a/sys/include/vfs_default.h
+++ b/sys/include/vfs_default.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2022 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2022 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/vfs_util.h b/sys/include/vfs_util.h
index 17b43f5fdf63..7211d7129ff0 100644
--- a/sys/include/vfs_util.h
+++ b/sys/include/vfs_util.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2021 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2021 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/volatile_utils.h b/sys/include/volatile_utils.h
index a844c10a90d4..aef66f0f2330 100644
--- a/sys/include/volatile_utils.h
+++ b/sys/include/volatile_utils.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/xtimer.h b/sys/include/xtimer.h
index 1f157e0c0dbd..2f08c757975e 100644
--- a/sys/include/xtimer.h
+++ b/sys/include/xtimer.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/xtimer/implementation.h b/sys/include/xtimer/implementation.h
index b50f5a9e3a2c..83390ea04ab8 100644
--- a/sys/include/xtimer/implementation.h
+++ b/sys/include/xtimer/implementation.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
- *               2016 Eistec AB
- *               2018 Josua Arndt
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2015 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-FileCopyrightText: 2018 Josua Arndt
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/xtimer/tick_conversion.h b/sys/include/xtimer/tick_conversion.h
index eaa88cb798af..67b278a37afa 100644
--- a/sys/include/xtimer/tick_conversion.h
+++ b/sys/include/xtimer/tick_conversion.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2016 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2016 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/zptr.h b/sys/include/zptr.h
index 464c3d4b9853..26c5e262b102 100644
--- a/sys/include/zptr.h
+++ b/sys/include/zptr.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer.h b/sys/include/ztimer.h
index 472e029f91e8..5c9369f4662d 100644
--- a/sys/include/ztimer.h
+++ b/sys/include/ztimer.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/config.h b/sys/include/ztimer/config.h
index 6b41f6798032..5feece6b3bb3 100644
--- a/sys/include/ztimer/config.h
+++ b/sys/include/ztimer/config.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/convert.h b/sys/include/ztimer/convert.h
index 36fcac89bdf8..9edeb9b8a028 100644
--- a/sys/include/ztimer/convert.h
+++ b/sys/include/ztimer/convert.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/convert_frac.h b/sys/include/ztimer/convert_frac.h
index 10c1ee446b00..33c9b7a1340f 100644
--- a/sys/include/ztimer/convert_frac.h
+++ b/sys/include/ztimer/convert_frac.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- * Copyright (C) 2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/convert_muldiv64.h b/sys/include/ztimer/convert_muldiv64.h
index 1d7958aad609..76a198066bcb 100644
--- a/sys/include/ztimer/convert_muldiv64.h
+++ b/sys/include/ztimer/convert_muldiv64.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/convert_shift.h b/sys/include/ztimer/convert_shift.h
index a7290f7099dc..60a6d6c5558a 100644
--- a/sys/include/ztimer/convert_shift.h
+++ b/sys/include/ztimer/convert_shift.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/mock.h b/sys/include/ztimer/mock.h
index b7eea964c261..169deb1577bc 100644
--- a/sys/include/ztimer/mock.h
+++ b/sys/include/ztimer/mock.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *               2018 Eistec AB
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2018 Eistec AB
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/overhead.h b/sys/include/ztimer/overhead.h
index 8a4f86722557..336c6d488142 100644
--- a/sys/include/ztimer/overhead.h
+++ b/sys/include/ztimer/overhead.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
- *               2020 Freie Universität Berlin
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/periodic.h b/sys/include/ztimer/periodic.h
index 00a21ecdf02e..9b48b86de462 100644
--- a/sys/include/ztimer/periodic.h
+++ b/sys/include/ztimer/periodic.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
- *               2020 Freie Universität Berlin
- *               2020 Inria
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2020 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2020 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2020 Inria
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/periph_ptp.h b/sys/include/ztimer/periph_ptp.h
index b78b4387ad0f..ea76b034e0ac 100644
--- a/sys/include/ztimer/periph_ptp.h
+++ b/sys/include/ztimer/periph_ptp.h
@@ -1,10 +1,7 @@
 /*
- * Copyright (C)    2018 Kaspar Schleiser <kaspar@schleiser.de>
-                    2021 Otto-von-Guericke-Universität Magdeburg
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-FileCopyrightText: 2021 Otto-von-Guericke-Universität Magdeburg
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/periph_rtc.h b/sys/include/ztimer/periph_rtc.h
index 0b7a3dadc0f8..33c8e3fcf57a 100644
--- a/sys/include/ztimer/periph_rtc.h
+++ b/sys/include/ztimer/periph_rtc.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/periph_rtt.h b/sys/include/ztimer/periph_rtt.h
index b4c170611e8e..92a0a7d11bfa 100644
--- a/sys/include/ztimer/periph_rtt.h
+++ b/sys/include/ztimer/periph_rtt.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/periph_timer.h b/sys/include/ztimer/periph_timer.h
index 8905f8f502db..3fd767fd95f9 100644
--- a/sys/include/ztimer/periph_timer.h
+++ b/sys/include/ztimer/periph_timer.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2018 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License v2.1. See the file LICENSE in the top level directory for more
- * details.
+ * SPDX-FileCopyrightText: 2018 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/stopwatch.h b/sys/include/ztimer/stopwatch.h
index 752148cb66b3..1c4b47685f99 100644
--- a/sys/include/ztimer/stopwatch.h
+++ b/sys/include/ztimer/stopwatch.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2023 ML!PA Consulting GmbH
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2023 ML!PA Consulting GmbH
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer/xtimer_compat.h b/sys/include/ztimer/xtimer_compat.h
index b4f0ef9f5449..12508664c47e 100644
--- a/sys/include/ztimer/xtimer_compat.h
+++ b/sys/include/ztimer/xtimer_compat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer64.h b/sys/include/ztimer64.h
index 08930312318e..e678caff93dc 100644
--- a/sys/include/ztimer64.h
+++ b/sys/include/ztimer64.h
@@ -1,11 +1,8 @@
 /*
- * Copyright (C) 2021 Inria
- *               2021 Freie Universität Berlin
- *               2021 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2021 Inria
+ * SPDX-FileCopyrightText: 2021 Freie Universität Berlin
+ * SPDX-FileCopyrightText: 2021 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once
diff --git a/sys/include/ztimer64/xtimer_compat.h b/sys/include/ztimer64/xtimer_compat.h
index 74fa861bea7b..0f6e183ac4f4 100644
--- a/sys/include/ztimer64/xtimer_compat.h
+++ b/sys/include/ztimer64/xtimer_compat.h
@@ -1,9 +1,6 @@
 /*
- * Copyright (C) 2019 Kaspar Schleiser <kaspar@schleiser.de>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License v2.1. See the file LICENSE in the top level
- * directory for more details.
+ * SPDX-FileCopyrightText: 2019 Kaspar Schleiser <kaspar@schleiser.de>
+ * SPDX-License-Identifier: LGPL-2.1-only
  */
 
 #pragma once