That strategy doesn't work in my country as the law clearly stated mere protocol is not copyrightable. Another interesting case was, Nintendo released a floppy

That strategy doesn't work in my country as the law clearly stated mere protocol is not copyrightable. Another interesting case was, Nintendo released a floppy disk with their logo relief and use its presence for DRM purpose. When third party released a compatible floppy disk, Nintendo sued them for trademark violation. Nintendo lost.