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Originally Posted by griffin
A plugin is not modifying any part of the wordpress source code, it is not a derivative work of wordpress, it is a standalone piece of software that uses the provided interface. There is nothing in the GPL prohibiting any license from utilizing an interface provided by a piece of GPL'd software.
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You might want to read
this FAQ answer. Also, the
WordPress Codex says that:
The GPL pretty clearly says that anything linking to the GPL-licensed code should also be licensed under a compatible license.
Although plugins are somewhat (or, sometimes) in the gray territory, there are some cases of companies distributing the original software and their custom plugins as a single package, in which case (in my opinion) it should definitely be considered a derivative work of the original software.