"Think of forgery and plagiarism.  In forgery, a scoundrel pretends his work is that of someone else because the false attribution will make the work more valuable.  People forge paintings and statues.  By contrast, with plagiarism, people copy the actual work of others, but pretend it is their own.  People plagiarize music and books and film.  The difference shows what is valued—with paintings and sculpture, it’s the name of the creator; with music and movies and books, it’s the content."