Actors are very concerned with ensuring that they have the right over what they say and what they do in movies. James Earl Jones has given permission for him to be Darth Vader long after he's no longer on the earth. I was actually watching as a documentary about the basketball player, Wilts Chamberlain on Showtime using his voice. And weirdly enough, I know Wilts Chamberlain because my dad wrote a book about him and that voice is not what Wilts sounded like.