The concept of the public domain is the focus of a firestorm of debate, precipitated by some of the most important controversies of our digital age. This debate, however, is deeply flawed in two critical respects. First, the debate has invoked the public domain without a clear understanding of the origin of the term and the first principles that courts enunciated in recognizing the concept. Second, the debate has focused almost exclusively on intellectual property law in analyzing the public domain, ignoring the many uses of the term in other areas of law, such as First Amendment rights of access, government secrecy agreements, espionage, the Freedom of Information Act, and regulations governing classified information and munitions lists. T...