If we start with the assumption that copyright law creates a system of property rights, to what extent does this system give adequate notice to third parties regarding the scope of such rights, particularly given the prominent role played by the fair use doctrine? This essay argues that, although the fair use doctrine may provide adequate notice to sophisticated third parties, it fails to provide adequate notice to less sophisticated parties. Specifically, the fair use doctrine imposes nearly insuperable informational burdens upon the general public regarding the scope of the property entitlement and the corresponding duty to avoid infringement. Moreover, these burdens have only increased with changes in technology that enable more, and mor...