If you have any movie DVD or music CD, there must be some sort of warning or notice which claims that you cannot copy, modify, redistribute partial or full media of it. It is illegal to redistribute copy-righted, patented music tracks, for example, Star Trek soundtracks, whether you use it for commercial or not. There are even college students in Taiwan been suit and sentenced because they download and redistribute MP3 songs with P2P software. I don't know the law in your country, or those people who include copy-right musics in their mod, but I cannot do that.