Copying of code needs to be very direct. Even Google copied tens of thousands of lines of code from Oracle character for character and won the case taken all the way to the Supreme Court. When Oracle made changes (even during the court proceedings), Google kept copying the code and every change Oracle made. So I doubt you’re at real legal risk with what you were proposing.
Is your argument in good faith? Seems like you know enough about the matter to destinguish an API definition from implementation. That's what that ruling was about, and you seemed to know it, yet make the comparison as if it was valid.
