Copyright 2017 Victor ADASCALITEI <victor.adascalitei@gmail.com>

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

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The work is derived from the following work:

kaptcha - A kaptcha generation engine.
Library code is delivered under the Apache v2.0 License and it is
Copyright (C) 2008 http://code.google.com/p/kaptcha/
The library was originally copyrighted in 2005 by keesjanvoogd at users.sourceforge.net

The Pixels library is taken from: https://pixels.dev.java.net/