In July 2011, a consortium of major content providers and Internet service providers announced their intention to implement the Copyright Alert System, a graduated response plan aimed at stemming online copyright infringement by individual users. While other commentators have examined the rise of these systems abroad and certain potential issues with the implementation of such measures in the United States, little has been said about the antitrust implications of a private system of copyright enforcement. This article recounts the history of online infringement leading up to the Copyright Alert System and then analyzes the system from the perspective of antitrust law, taking the position that the system announced raises significant antitrust concerns. The article concludes with recommendations for improving the current system to protect the rights of consumers.