If I use music, that is released under Creative Commons Share Alike license as background for my video, does that fact cause whole video to be derivative work, thus requiring it to be released also under CC-SA license?
Can soundtrack and video be treated as two separate works (if they are contained and released as single file)? Can different license be attached to image and sound?
It's obvious to me, that if soundtrack music is licensed under CC BY-NC-SA (Creative Commons, Attribution, Non-commercial, Share Alike), whole work cannot be used commercially, because that would break the Non-commercial clause of soundtrack. And then I would like to release video part with ND (No Derivatives) clause, so it could only be used unaltered.