On Tue, Aug 4, 2009 at 3:45 PM, Dr Nicholas J
"Derived work" in the context of the GPL is entirely a question of
copyright. If two works have been produced completely independently
-- for example if their authors produced them without being aware of
one another's existence at all -- then I don't think there could be
any basis for considering either of them a derived work of the other.
This could routinely be the case for a LADSPA plugin and host, for
If your interpretation was correct, then I could require Cubase to be
GPL'd by writing a VST plugin for it and publishing it under the GPL.
This would obviously be absurd. In real life, a court faced with a
problem like this would surely have to consider the circumstances of
authorship: is it actually reasonable to describe program A as being
derived from program B, to the extent that the terms of program B's
license must be considered when redistributing program A? That
consideration would surely vary hugely from case to case.
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