Where are you getting the information about contractual rights on likenesses?

I’m curious to know if actors’ contracts have evolved on this over time. I would have thought Paramount would be the exclusive rights holder.

Marina Sirtis, for example, has commented that she wasn’t even informed in advance about her image as Troi being on a recent UK stamp. She says that she has no rights in relation to her likeness as Troi, the rights remain entirely with Paramount.