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From the FAQ, I don't get why the code has to be GPL licensed. It talks about libraries, "entire combinations", "software modules that link" and "work as a whol

• lvass 6y ago
  Compatibility with GPL in this case simply means a software distributed in a compatible license like MIT can be combined and distributed under GPL [0]. >On your second point: Can't they argue that they implement against an API, which could be provided by non-GPL software as well? I don't think that is reasonable. A GPL program is specifically named in requirements.txt and imported. It's essentially the same as dynamic linking, that is no more than naming a program and using it's API. If this argument was valid one could also argue it's possible to modify a dynamically linked binary's rpath (can be easily done with patchelf on GNU/linux) from a GPL library to a non-GPL one so dynamically linking a library would never require you to do abide to it's license, which is obviously untrue [1]. [0]http://www.gnu.org/licenses/gpl-faq.html#WhatDoesCompatMean http://www.gnu.org/licenses/gpl-faq.html#WhatDoesCompatMean [1]http://www.gnu.org/licenses/gpl-faq.html#GPLStaticVsDynamic http://www.gnu.org/licenses/gpl-faq.html#GPLStaticVsDynamic