Abstract
Intellectual property theory grapples with intriguing questions about the political and personal significance of our mental labour and creativity, the metaphysics of art and expression, the justifications for private property, and conflicts between property and free expression rights. This chapter begins with an introduction to the nature of intellectual property, comparing intellectual property to physical property. It continues with an overview of some arguments for, and criticisms of, the legal protection of intellectual property, and concludes with some ethical issues about illegal downloading.