Abstract: A method of managing keys is provided. According to one exemplary method, digital content data encrypted with a first encrypting key is decrypted using a first decrypting key, and re-encrypted using a second encrypting key. A second decrypting key is encrypted using a third encrypting key to produce an encrypted second decrypting key. In some embodiments, an encrypted first decrypting key that was encrypted using a fourth encrypting key is received, and the encrypted first decrypting key is decrypted using a fourth decrypting key to reproduce the first decrypting key. An application for use on a computer system is also provided.

Abstract: A method is provided for tracking digital content received at a first device. According to the method, a first watermark is embedded in the digital content. The first watermark includes information for identifying a user of the first device and/or information for identifying a licensee of the digital content. The digital content is received from a content provider at the first device. In some embodiments, the first device is an end user device and the embedding is performed by this end user device. In other embodiments, the embedding is performed a source of the digital content, a copyright owner of the digital content, or the content provider.

Abstract: The present invention provides a system, computer program product and a method for overlapping boundary data of an audio information track which includes ending data from a previous track and starting data from a succeeding track. By doing this, the ending data from a previous track and the beginning data from a succeeding track are available for the compression process. The compression program then manipulates the additional appended data in order to generate the compressed audio. Later, by severing the overlapping appended additional information before recombining the tracks, the resulting No-Pause CD audio stream is free from distortion and mismatch.

Abstract: A game programming system uses rewritable cartridges that are compatible with commercially available game systems to produce game cartridges at a point-of-sale location so that retailers only need to stock sufficient uniquely designed game blanks to meet consumer demand. A game programmer or programming device loads digital content from computer storage to a rewritable game cartridge incorporating reprogrammable flash memory. The system includes flash rewritable cartridge identification hardware that allows verification of the cartridge to identify it as proprietary to a particular manufacturer or authorized dealer. The system provides for game content to be erased from the cartridge and new game content to be programmed so that the cartridge can be reused time after time to house any number of programs. During a cartridge write operation, a game programmer interface accepts data stored in a personal computer (PC) and fills first in first out (FIFO) memory.

Abstract: A boundary scan system for a data processing system using serial scan techniques for diagnostics comprises gated circuitry for each adapter card slot for controlling the propagation of controller generated diagnostic signals throughout the data processing system and the components included on the system's planar and each adapter card present, adapted to serially scan all present adapter cards and to provide electrical conduit to the next serially connected component in the absence of a card at an adapter slot.

Abstract: A system and method is provided for dequeuing connection requests in a data communications system comprising a calling subsystem and a called subsystem connected by a serial simplex switch. The connection requests are made by the calling subsystem to the called subsystem by sending a connect request message to the switch and queuing the connect request message in a buffer therein. The switch establishes a connection between the calling subsystem and the called subsystem by thereafter queuing the connect request message in a buffer in the called subsystem. Concurrently, the switch sends a connect request acknowledge message to the calling subsystem while the calling subsystem sends a connect request dequeue message to the switch.

Abstract: A sequencing scheme is provided for prioritizing bus operations occurring in simplex switches which interconnect subsystems in a data communications system, thereby yielding improved aggregate system data throughput. The sequencing scheme provides procedures which simultaneously accommodate (i) concurrently pending requests to a first control bus which processes only circuit switched operations and (ii) concurrently pending requests to a second control bus which processes only packet switched operations, in an order which optimizes link level control message throughput of the simplex switch. The control messages which are coordinated by the sequencing scheme include connect and disconnect requests, connect and disconnect request acknowledgments, and data acknowledgments.

Abstract: A serial simplex switch design is provided which includes I/O ports each of which is configurable specifically for attachment to a data communications subsystem or, alternatively, for cascaded connection to a similarly configured I/O port on another switch. The switch provides a packet routing function including input and output buffers for each of its I/O ports wherein packets of control messages sent by one subsystem are temporarily stored prior to being delivered to the appropriate destination subsystem. When configured to be directly attached to a subsystem, the I/O ports separate control messages from incoming integrated data and control message strings. In a cascade configuration, however, a mechanism is provided wherein data and control messages are separated into two physical paths to eliminate the delays associated with integrated data and control message flow through the cascaded I/O port.

Abstract: A cable for the transmission of audio frequency currents with reduced distortion has at least one pair of electrical conductors insulated from one another. A ferromagnetic foil is closely (less than one half millimeter) applied to the conductors. The ferromagnetic foil couples the equal and opposite external magnetic fields generated by the signal currents. This greatly reduces distortion due to the frequency-dependent magnetic effects on signal transmission.