Package: hydrogen Severity: normal Content under directory data/drumkits/GMkit is derived from non-free sources (seems to be taken from Roland XV-5080 internal sound libraries). The file data/drumkits/GMkit/drumkit.xml only says "undefined license".
Manufacturers of hardware synthesizers sometimes don't say which license applies to their bundled sample libraries, but they are certainly not in the public domain. They typically allow commercial content created with them, without paying royalties, but they could complain if someone creates a competing product derived from their sounds. A software synthesizer can be seen as a competing product (there are precedents of this by Roland Corporation in particular). Moreover, please consider documenting all files under "data" directory in debian/copyright, it will make easier to spot this issues, I've been using the Roland samples in this package for years without knowing.
