> I can introduce such a function into XForms in a matter of minutes.

and anyone could

> If I do so, does the lyx licence become 'de facto GPL'?

that would be an easy way to change licenses. 

we could also turn it around: introduce a function that references to a closed library 
and the license automagically includes the relevant exception for that library

i don't think that it works this way

i would think that a license is a license, and the only way to change it, is to change 
it explicitly

but then again ... IANAL

regards, ed.


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