Back in February, the Creative Commons organization began taking steps to introduce compatibility between their licenses and the GPL. At that time, we took notice and started discussing the problems we’ve had with CC licenses in the directory in the past. Part of the problem is that the Creative Commons licenses are so fragmented. It’s very much a choose-your-own adventure landscape for CC licenses, and many people don’t understand licensing very well in the first place (it can be confusing, I admit). Since we require everything in our directory to be GPL Compatible, then it’s something we have to constantly scan for when even an accidental violation occurs. Then, things became even more interesting in March, when silently changed their compatibility page to state that CC-BY 4.0 was now considered compatible with all versions of the GPL. So, at that time, we started trying to ignore that particular case. It isn’t easy, because a lot of CC licensed code is licensed under version 3.0 of their licenses, which is not GPL Compatible. And the issue of CC-BY-SA was still very much up in the air. However, last month, Creative Commons finally stepped up. CC-BY-SA 4.0 is now compatible
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