This advise by the Solicitor General hinges on an interpretation of section 102(b) of the copyright act. That section essentially says that "methods of operation" can't be copyrighted.
The Solicitor General does not understand that APIs are a formalized description of "methods of operation" (page 14). I suggest reading the entire advisory, it's quite frustrating and contradicts itself.
The Solicitor General does not understand that APIs are a formalized description of "methods of operation" (page 14). I suggest reading the entire advisory, it's quite frustrating and contradicts itself.