"For me, declaring code is not code," Page said. This sentence sounds pretty odd to me. What does Larry Page mean?
Describing interface with words is exactly the same as declaring it with code. So such code is nothing more or less than verbal description of the interface (or any other description of it using any other syntax).
Not sure if that helps. If you can copyright interface, or just algorithms. Unless Java interface was specifically made free and open by Sun then it's really clear cut case.