My website is throwing a contest for hip hop producers where cash prizes will be given to the winners. Each producer will enter a beat they've created into the contest. I want to allow for sampling (taking a portion, or sample, of one sound recording and reusing it as an instrument or a different sound recording of a song or piece).
If a contestant does use a sample, must it be cleared? They are not selling the beat for monetary gain but can possibly win a cash prize. What legal issues, if any, do they and/or I face? Thanks for any responses.