In Italian "api" means "bees" (plural). API in computer science means "Application Programming Interfaces", which are bits of code in a computer program that expose functions and calls to other computer programs so that they can interact. For instance, a platform (say, Gnome or MS Windows) can expose a function to call upon a printing dialog, and all application running on it only needs to invoke that function and an interaction can happen, so the application can print. The internals of the same API can be reimplemented many times without changing the outward facing interfaces, so that the applications written against them remain workable ‒ actually this happens on a regular basis.
A Federal Judge for the Northern District of California has ruled that the source code that declare a method to invoke the same function as in the API (thus representing the outward facing part) is not subject to copyright. This follows a quasi identical ruling of the European Court of Justice in the SAS case [Case C‑406/10].