Since the rise of Napster and other file-sharing services in its wake, most of us have assumed that intellectual piracy is a product of the digital age and that it threatens creative expression as never before. The Motion Picture Association of America, for instance, claimed that in 2005 the film industry lost $2.3 billion in revenue to piracy online. But here Adrian Johns shows that piracy has a much longer and more vital history than we have realized--one...