Abstract: A computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information library programs to a client computer system and a mobile digital information playback device removably connectable to the client computer system. The present invention is a computer network based library and information delivery system for accessing and obtaining selected digital information files.

Abstract: A computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information library programs to a client computer system and a mobile digital information playback device removably connectable to the client computer system. The present invention is a computer network based library and information delivery system for accessing and obtaining selected digital information files.

Abstract: A method and apparatus for digital content license management is disclosed that provides one or more license management devices that manage licenses for playback of digital content. The license management devices create licenses having an associated cardinality that determines the number of playback devices that can be authorized by the license. The license is stored in a set of playback devices, where the number of playback devices in the set corresponds to the cardinality of the license. The license is also included in digital content that the license authorizes for playback. Playback devices that have a license that matches a license included in the digital content are authorized to play the digital content. A single license can be used to provide authorization to play digital content from multiple sources and/or multiple types of content.

Abstract: A method, apparatus, and article of manufacture for targeting a digital information playback device. A device ID and or a group ID is embedded in the playback device. A device ID or a group ID is also embedded in a digital information file. Upon receiving the digital information file, the device ID or the group ID of the playback device is compared to that contained in the digital information file. The digital information file is then played if either the device ID or the group ID of the digital information file matches that of the playback device.

Abstract: A computer network based digital information library system employing authentication and encryption protocols for the secure transfer of digital information library programs to a client computer system and a mobile digital information playback device removably connectable to the client computer system. The present invention is a computer network based library and information delivery system for accessing and obtaining selected digital information files.