gfp writes: > 1. > what copyright licence would be appropriate > that only the GUIX community can use my song, > but nobody else? This kind of exclusion of the world is inherently incompatible with the values at the heart of Free Culture and of Guix. I know that this is unusual compared to much of the world being about conflict between different groups, and I know that it can take some time to get used to. It took me some time to do it back when I built fantasy worlds. But it is worth it. It is what makes Free Software special — building creations for all of humanity instead of only to those who are part of an in-group. If you however want to prevent people from using the song to corrupt the core values of Guix, a sharealike license is the way to go: only allow those to use the song who support similar values of Free Culture. It doesn’t matter how their community calls itself as long as they adhere to the Freedoms the Sharelike license protects. Best wishes, Arne