Widespread file sharing has led content industries - publishers and distributors of books, music, films, and software - to view their customers as growing threats to their survival. Content providers and their allies, especially the U.S. government, have pushed for stronger global copyright policies through international treaties and domestic copyright reforms. Internet companies, individuals, and public-interest groups have pushed back, with massive street protests in Europe and online "internet blackouts" that derailed the 2012 U.S. Stop Online Piracy Act (SOPA). But can citizens or...