If you only stick to the API and ignore the implementation, it is not Mickey Mouse any more but a rodent. If it was just a clone it wouldn't be 50x as fast. Nevertheless, APIs apparently can be copyrightable. I generally disagree with this; it's how PC compatibles took off, giving consumers better options.

Wait what, didn't oracle lose the case against Google? Have I been living in an alternate reality where API compatibility is fair use?

[dead]