It does. There are some who would argue that the Linux copyright fight is already resolved because of the SCO suits, but that's wrong because
A: some of those suits are still ongoing, and
B: the suits never alleged infringement based on the API alone, SCO was claiming that Linux copied functional code in multiprocessing modules (we don't know which functions because they demand secrecy, even though it's open source).
Not even SCO, trolls that they are, were insane enough to claim that the APIs themselves are copyrighted.
