How can you close source a GPLed product?
If you own all copyrights,
you can say that from certain version onwards, the code is no longer under GPL.
You cannot do anything about those versions already released under GPL. Also, if
there are contributions by other people, and they have not assigned the rights
to you and do not agree with your license change, you cannot do it without
entirely removing those contributions.
This kind of thing has happened with
some projects, and if the software matters to many people, the result is usually
a GPL'd and often renamed fork of the code, based on the last GPL'd version. If
not enough people care, the project typically withers after the license
change...
(Ob.Disclaimer: This is not legal advice. The above is just my
understanding, based on years of observing going-ons in the F/OSS world. Hire a
lawyer if the answer matters).
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