We all create intellectual property. We all use intellectual property. Intellectual property is the most pervasive yet least understood way we regulate expression. Despite its importance to so many aspects of the global economy and daily life, intellectual property policy remains a confusing and arcane subject. This engaging book clarifies both the basic terms and the major conflicts surrounding these fascinating areas of law, offering a layman's introduction to copyright, patents, trademarks, and other forms of knowledge falling under the purview of intellectual property rights. Using vivid examples, noted media expert Siva Vaidhyanathan illustrates the powers and limits of intellectual property, distilling with grace and wit the complex tangle of laws, policies, and values governing the dissemination of ideas, expressions, inventions, creativity, and data collection in the modern world. Vaidhyanathan explains that intellectual property exists as it does because powerful interests want it to exist.