Earlier quoted context omitted.
This is tricky because if you declare any API no matter how trivial copyrightable then the first guy to copyright a function to compute sqrt, tan, atan, etc wins. And if you can't copyright trivial interfaces then the question becomes where the line is drawn. There's far more at stake than Oracle trying to squeeze money out of Google.
I completely agree, but I don't really know what to do about it. Surely a document describing a useful software interface (GUI, CLI, API) is a creative work and takes effort to produce. Unless we just agree that it's a necessary exception for the purposes of interoperbility I'm not sure how I would argue that it shouldn't fall under copyright protection.
Sure, but they didn't copy said document. Comments, documentation etc. were not used. Implementation was not used.
The things that were the same were the method signatures and side effects. Is that copyright? I would argue its clearly not.