US Patent 7577809 Content control systems and methods

A control system comprises an interface configured to receive a content request from a request source wherein the content request identifies content stored on a storage medium. The control system also comprises a processing system coupled to the interface and configured to process the content request to determine when the request source is a valid destination for the content based on a first identifier stored with the content. The interface is further configured to transfer the content to the request source when the request source is a valid destination.