An author of fiction may sometimes retain copyright for some forms of derived works, ex "movie rights" [0], with the expectation that they aren't worth much unt

An author of fiction may sometimes retain copyright for some forms of derived works, ex "movie rights" [0], with the expectation that they aren't worth much until the original literary work has drawn a significant audience. [0] https://youtu.be/Rjv1NlMiUyI?t=65 https://youtu.be/Rjv1NlMiUyI?t=65