An API is more than a table of contents. When I write a method and give it a name and define what parameters it accepts, that is just as much part of the code a

An API is more than a table of contents. When I write a method and give it a name and define what parameters it accepts, that is just as much part of the code as the inner workings of the method itself. I'm not a big fan of copyrighting in general but I am struggling to see understand how the code that defines an interface is separate from the rest of the code.