An API is the knowledge of what methods are available, how to call them and what they do. How is that not fact?
To quote yourself
While I recognise that creating a good API is indeed a difficult task
If you're creating it, it's not a fact, is it?

Unless you want to argue that everything ever created becomes a fact, in which case we can just ditch copyright law, and software licenses right away.

In reply to Re^3: Copyright on languages by JavaFan
in thread Copyright on languages by ikegami

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