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The second question should be clear, now: I should release the new source code (the plugin, not the closed source) as GPL.

Still not sure about the first question. This is not my case, but just to clarify: if somebody writing a closed-source program and sell it, and that program is using GPL'd DLL, is that violating the GPL license?

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Yes, the GPL requires the complete program to be available under the GPL (with explicit exceptions for system libraries).

For example this is the case with MySQL, where the client library is licensed under the GPL, therefore any client program linking to it has to be GPL (unless you pay for a commercial license).

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