This is from the US Copyright Office's Circular 14 Copyright Registration for Derivative Works
WHO MAY PREPARE A DERIVATIVE WORK?
Only the owner of copyright in a work has the right to prepare, or to authorize someone else to create, a new version of that work. The owner is generally the author or someone who has obtained rights from the author.
I have never authorized a derivative work for my play TAM LIN, so anybody who claims to have a copyright on such a derivative work has obtained it unlawfully.