Is copyright limited to idea or expression of idea?

Answer:
Copyright does not protect names, titles, common words/phrases, facts, ideas, discoveries, systems, or methods of operation.

It may protect the way these things are expressed (graphics, video, audio, etc) provided they meet the necessary criteria for copyright registration.
First answer by EndTrans. Last edit by EndTrans. Contributor trust: 409 [recommend contributor recommended]. Question popularity: 1 [recommend question].