Anderson argued that the version of Rocky IV that the studio released was similar to his treatment and believed that they had stolen his ideas.
A judge, however, ruled that since Stallone had ownership of the characters in the treatment, Anderson’s work wasn’t protected by copyright laws.
There are some pretty legendary fights onscreen throughout Rocky IV, but there was also one behind the scenes regarding the origin of the film’s script, so much so that it went to court in the State of California.
Anderson appealed but the matter was later settled out of court.