This document discusses the legal definitions and history of obscenity, indecency, and profanity in media in the United States. It outlines key Supreme Court cases that have established and refined the definitions of obscenity and indecency, and delineated what types of sexual or profane content are protected by the First Amendment versus what can be restricted by the government. It also discusses how these restrictions have been applied differently to different media such as broadcasting, cable, mail, and zoning laws regarding adult businesses.