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I remember trying to explain that in a thread a while back about the creator of "Ghost Rider" suing Marvel, right around the time the first film came out. Poor guy never saw a cent for anything outside of what he was paid for working on the comic- nothing for merchandising, movie rights, not even appearances in comics other than the ones he personally worked on.
Cum catapultae proscriptae, soli proscript catapultas habebunt!