On 03/29/2013 10:39 PM, Urs Liska wrote:
> First of all, I think we have quite a consensus on what we intend - which is 
> a good start.

Yup. :-)

> I slightly disagree, although your considerations are valuable and give some 
> good insights in the situation.
> I think the 'ambiguity' Joe is talking about is the ambiguity of LilyPond's 
> input files being 'user documents' and at the same time compilable source 
> code.

Interestingly, it seems that TeX people are developing similar licensing
concerns -- see e.g.:
http://tex.stackexchange.com/questions/69007/the-gpl-and-latex-packages

> I would say that the whole LilyPond input file should be considered as a 
> 'user document', and that the author should be completely free to decide upon 
> its licensing, whether or not he uses included functions from LilyPond's 
> distribution.
> But as this discussion shows it's not really clear how GPL's licensing model 
> applies for that somewhat ambiguous situation. So it might actually be 
> necessary to clarify that.

The problem is that while I think we can all agree on _intent_, the strict
letter of the license may mandate something different.  This is not easy to
understand and seems to me to be very much a niche case -- your remark that .ly
input files can be simultaneously both user documents and source code seems to
me to capture the essence of the problem, which is shared with TeX.

I feel that possibly the best solution here is probably to approach the Software
Freedom Law Center and ask their advice.  If people are interested in taking
that approach I will draft an email (which could be sent by me or by someone
closer to the core of the project, depending on preference).

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