EARLY VERSIONS of this book were read by a number of people. I am grateful to those who offered critical (and sometimes especially critical) comments—in particular Bruce Ackerman, Yochai Benkler, David Bollier, Scott Hemphill, Dewayne Hendricks, Tom Maddox, Charles Nesson, Richard A. Posner, Barbara van Schewick, Timothy Wu, and Robert Young. My research was aided by an army of students, including Amy Ash, Scott Ashton, Aaron Bukofzer, Sky Canaves, Brian Gustafson, Drew Harris, Scott Hemphill, Matt Kahn, Matt Rice, Hilary Stockton, and Jonathan Sanders. Pauline Reich, Hilary Stockton, and Richard Taketa contributed examples to the text