“The Copyright Act does not expressly render anyone liable for infringement committed by another.” Sony,. However, common law doctrines permit a court to impose secondary liability where “just” and appropriate. Capitol asserts that ReDigi is secondarily liable for its users’ direct infringement under three such doctrines: contributory infringement, inducement of infringement, and vicarious infringement. The Court agrees with respect to contributory and vicarious infringement, and therefore does not reach the inducement claim.