> I have a question concerning the GPL. Is it permissible for an app > under a GPL-incompatible license to provide output in LilyPond code? > For example, could Finale provide a Finale->LilyPond converter even > though the mechanics are shrouded in mystery?
IANAL, but I don't think this would be a problem. Finale cannot incorporate any of Lilypond's code in order to achieve this functionality, but I don't thing anything would stop them from implementing it themselves. This reminds me of MATLAB and GNU Octave. There this situation is reversed, in that the proprietary program came before the GPL'd program, but it is another example of two programs with incompatible licenses using the same syntax.
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