You also need tolook up "performers' rights" and "performers' property rights".

Back then it was the Performers Protection Acts 1958 to 1972 and the Rome Convention, but some of the wrinkles of teh law and whether it conferred a civil right of action were not really sorted out until Rickless -v- United Artists. Elwood Rickless was Peter Sellers Executor, adn some of Sellers outtakes were used by UA to make a new Pink Panther film. Elwood won, UA lost.