Add cc-by-nc-2.0 to list of licenses

[albertvillanova]

This PR adds the cc-by-nc-2.0 to the list of licenses because it is required by scifact dataset: https://github.com/allenai/scifact/blob/master/LICENSE.md

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[julien-c]

this list needs to be kept in sync with the ones in moon-landing and hub-docs :)

[albertvillanova]

@julien-c don't you think it might be better to a have a single file (source of truth) in one of the repos and then use it in every other repo, instead of having 3 copies of the same file that must be kept in sync?

Also note that the licenses we are adding were all already present in our previous licenses.json file: are we regenerating it, step by step? Why don't we use a file with ALL the licenses we previously had in the list?

Licenses added:

• Add "cc-by-nc-sa-2.0" to list of licenses  #4887
• Add cc-by-nc-2.0 to list of licenses #4930

Previous licenses.json file:

• https://github.com/huggingface/datasets/blob/b7612754928e0fd43b9e3c3becb906ec280ff5d4/src/datasets/utils/resources/licenses.json
• removed in this commit: 9f77254

Let me know what you think and I can take care of this.

[julien-c]

Let me know what you think and I can take care of this.

What I think is that we shouldn't add licenses that are just used in a couple of datasets, and just use license_details for this.

don't you think it might be better to a have a single file (source of truth) in one of the repos and then use it in every other repo, instead of having 3 copies of the same file that must be kept in sync?

Yes, in my opinion we can just delete this file from datasets, the validation is happening hub-side anyways now?

[lhoestq]

Feel free to delete the license list in datasets @albertvillanova ;)

Also FYI in #4926 I also removed all the validation steps anyway (language, license, types etc.)