The wildcard here is the publisher they ripped the CDs from. TOS Fan films used to have a very limited repertoire but now there's the LaLa Land TOS boxed set, hence the keys to the entire kingdom. It's certainly possible LaLa Land might take issue with the music being used even if CBS doesn't. Same deal with the publisher of any other Trek music, and if they participate in the Youtube fingerprinting system, then it could get yanked automatically. Vimeo is a better home for this stuff, but there's a fraction of the traffic there as there is on Youtube.