Okay, taking Doctor Who as an example, I’m guessing that the BBC can use the images of the actors who played any of the Doctors, as they portrayed those particular characters, in any future episodes? For instance, in the “Five Doctors”, they had a First Doctor played by an actor who resembled the late William Hartnell. Could a computer generated Fourth Doctor (for instance) be dropped into a current episode whether Tom Baker hollers or not (doubt that he would)?
The same with the Star Trek remake. I know they tried to get the blessings of as many original actors as they could, but could they have a new Kirk with a pissed off Shatner?