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I'm pretty sure the FSF is stretching a bit there. If you base the source of the child class on the publically documented parent class interface, rather than on the source of the parent class, you're OK. (The resulting binary, if you generate one, is of course still a derived work)

Claiming otherwise is a bit dodgy. If it works the way they say, making a child class of a GPL class makes your code GPL. If that was true then if someone released a version of, say, the C runtime library that was GPL (rather than LGPL) it would make your entire system and all the code that made it up GPL'd.

The derived work, generally, is the executable not the source. The source is only a derivative work when it's a modification of someone else's source, which is almost undoubtedly not the case. The wording here is a bit ambiguous.


In reply to Re: Re: Re: Derivative Works and Perl Modules by Elian
in thread Derivative Works and Perl Modules by Anonymous Monk

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