In early 2007, Viacom sued Youtube for extensive copyright infringement. Youtube claimed protection under the Safe Harbor law in the Digital Millennium Copyright Act, but arguments still abound regarding the extent to which Youtube is liable for copyrighted files uploaded to its servers. In my paper, I will attempt to answer that question: how liable is Youtube for copyright infringement committed by its users and what can it do to ensure protection from further liability? I will begin my bibliography, and my paper, with the original Viacom lawsuit, followed by articles detailing the emergence of the DMCA. I will then cite several articles and cases arguing both for and against Youtube's innocence. This will be followed by several examples of steps Youtube can take to shield itself from liability. I will finish my argument by citing the judge's decision in the Viacom case, which still fails to offer a definitive answer of whether or not Youtube is liable for infringement.