facebook/zstd

[Question] Do you use GPLv2 or GPLv2+?

topin89 opened this issue · 2 comments

topin89 commented

In process of adding zstd support in Valgrind, authors asked if you use GPLv2 or "GPLv2 or later". Mostly because Valgrind itself is GPLv2+, and authors prefer this license over BSD if possible.

Can you clarifiy, do you allow to license Valgrind under GPLv3 or later license? I know that you can use it in GPLv3 code using BSD license, and mostly being pedantic. Still, it would be nice to have clarification

Cyan4973 commented

zstd is delivered with 2 licenses, and each user can select whichever is better for their need:

  • GPL v2: which is primarily there to ensure clear compatibility with the Linux Kernel
  • BSD 3-clauses: for eventually everything else, since BSD seems compatible with every other open source license out there.

The debate of v2 vs v2+ is relatively new, and it's unclear if it does really matter.
It would if our license was limited to GPL v2 only, and the intention was to integrate it into someGPL v3 project.

But that's not the case: BSD is compatible with GPL v3, so there is no such limitation.