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I'm not sure what you're getting at -- copying an API interface is allowed, because API interfaces are not copyrightable see Oracle v. Google.

API: Application Program Interface.

There is nothing other than the interface of an API to copy. That's what it is.

However, the implementation is what copyright protects, so, honestly, I think this whole article is not very relevant.

Yes, my point is that "the API" as in the interface itself can be the copied, but "the API" (implementation) cannot. Clear? :)