Some people call illegally copying movies and music, "piracy" or "theft". Richard Stallman says people should not call copying and distribution "piracy", because piracy is robbery with attacking ships, killing and stealing people, and owners of copyright use the word to say that such copying is as evil as piracy. Some courts say that the word "piracy" may be used, but the word "theft" may not be used. When people use the word "piracy" for copyright infringement, it usually means "selling of many copies without permission", but sometimes any "big copyright infringement".