Copyright is law which is used to prevent free copying of media, while "intellectual property" is a term cooked up by corporate suits to generalize copyright, trademarks, and patents and equate them with property law. Richard Stallman wrote about this.

It has become fashionable to toss copyright, patents, and trademarks—three separate and different entities involving three separate and different sets of laws—plus a dozen other laws into one pot and call it “intellectual property.” The distorting and confusing term did not become common by accident. Companies that gain from the confusion promoted it. The clearest way out of the confusion is to reject the term entirely.