According to Cyrille Chepelov <cyrille@chepelov.org>:
> Le Thu, May 02, 2002, à 10:02:57AM -0500, Lars Clausen a écrit:
>
> > Certainly if you change Dia, you must either not redistribute it or send
> > out the source along with it. Plug-ins I'm not so sure about, shapes are
> > probably not covered. But IANAL.
>
> For plug-ins it's up to "us" (ie, all holders of bits of copyright to the
> dia code): either we make a Linus Exception (and /all/ agree to do it), or
> the basic GPL applies and denies this.
IMHO plugins are GPLed because Dia is GPLed.
Again, IANAL.
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