1. A method of managing digital content licenses, the method comprising: creating a first license having a first cardinality, the license created by a license management device; storing the first license in a first set of playback devices in response to a command from the license management device, wherein the first set of playback devices is determined based, at least in part, on the first cardinality; storing the first license in first digital content; and authorizing playback of the first digital content with the first set of playback devices.