Jabref: license of external libraries not exact enough

[alick]

Steps to reproduce:

1. Check out https://github.com/JabRef/jabref/blob/master/external-libraries.txt
2. Note that it particularly says "BSD" is not exact enough
3. However, quite a few libraries has "BSD" as the license ID.

[lenhard]

I have the impression that this file is not maintained as rigorously as other things. Some libraries (jgoodies, etc.) in there have already been removed from JabRef.

In anything license-related @koppor is our expert.

[koppor]

Yes, we shall use the SPDX License Identifiers.

I wonder whether you read line 11 onwards in the file:

We follow the SPDX license identifiers.
[...]
For instance, "BSD" is not exact enough, there are numerous variants out there: BSD-2-Clause, BSD-3-Clause-No-Nuclear-Warranty, ...

Feel free to open a pull request fixing the license statements for each listed library.

[stefan-kolb]

@lenhard We still have jgoodies stuff in there?! Judging by the dependecy graph.

[Siedlerchr]

Yes but we removed the jgoodies look and feel libs

[alick]

OK I'll do a license audit/check when I get the time.

Please remove any libraries that are no longer in use if any.

[koppor]

@alick Can you do a cross-check with build.gralde when you are on it? We do not know by heart which libraries we included an dropped. The build.gradle is the single source of truth.