you really need an entertainment law attorney to advise you. often if you have a local users group, union, ITVA or other organization, they can perhaps provide free or cheap advice. rights can be a minefield, and are kind of a prickly issue these days.
there are books available, but put them in the perspective that there are attorneys who spend their careers learning entertainment law and copyright, so a book may not be the final bit of info you need to keep you out of court.
dare i ask why you didn't get the clearances before cutting the project?
hd