1
Ron D Katznelson: Metering retrieval of encrypted data stored in customer data retrieval terminal. Titan Linkabit Corporation, Cable Home Communication Corporation, Edward W Callan, April 23, 1991: US05010571 (394 worldwide citation)

A system for controlling and accounting for retrieval of data from a CD-ROM memory containing encrypted data files from which retrieval must be authorized. The system includes an authorization and key distribution terminal and a plurality of customer data retrieval terminals having such memories loa ...


2
Klein S Gilhousen, Charles F Newby Jr, Karl E Moerder: Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals. M A COM Linkabit, Edward W Callan, September 23, 1986: US04613901 (282 worldwide citation)

A system and method for scrambling and selectively descrambling television signals that are transmitted to subscribers' descramblers in a subscription television system. A working key signal is generated by processing an "initialization vector" signal in accordance with the DES algorithm upon the al ...


3
John W Evans: Capacitance-variation-sensitive touch sensing array system. Integrated Touch Arrays, Edward W Callan, March 22, 1988: US04733222 (238 worldwide citation)

A capacitance-variation-sensitive touch sensing array system includes an array of electrodes where each electrode is a connected series of conductive tabs and forms either a row or a column of the electrode array; an array of drive lines where each drive line is capacitively coupled to a plurality o ...


4
Klein S Gilhousen, Jerrold A Heller, Michael Van Harding, Robert D Blakeney II: Selective-subscription descrambling. M A COM Government Systems, Cable Home Communication, Edward W Callan, December 8, 1987: US04712238 (230 worldwide citation)

A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the scrambled signal is compared with a received authorization signal indicating whether the subscriber ...


5
Christopher J Bennett, Michael V Harding, Paul Moroney: Reproduction of secure keys by using distributed key generation data. General Instrument Corporation, Edward W Callan, September 5, 1989: US04864615 (219 worldwide citation)

A key security system provides for the reproduction of secure keys by using distributed key generation data and a distributed encrypted prekey. The system encrypts program key generation data with a program key prekey in accordance with a first encryption algorithm to produce the program key; proces ...


6
Karl E Moerder: Descrambler subscriber key production system utilizing key seeds stored in descrambler. M A COM Government Systems, Edward W Callan, January 6, 1987: US04634808 (169 worldwide citation)

A system for reproducing in a descrambler of a subscriber communication network a subscriber key signal that is unique to the descrambler and was used in encrypting a key signal that must be decrypted for use in descrambling a signal received by the descrambler. The scrambled signal is received by t ...


7
Christopher J Bennett, James M Hobza, Ron D Katznelson, Gordon K Walker: Receiver access interface to service components in television channel. M A COM Government Systems, Cable Home Communication, Edward W Callan, March 13, 1990: US04908859 (160 worldwide citation)

A receiver interface system for enabling an operator to access different types of services in a like manner, wherein the services contain different combinations of service components received by a receiver in different portions of one or more different frequency channels, such as television channels ...


8
Christopher J Bennett: IPPV programming distribution control system. General Instrument Corporation, Edward W Callan, December 4, 1990: US04975951 (160 worldwide citation)

A distribution control system for controlling the distribution of scrambled impulse pay per view (IPPV) programming from a plurality of different IPPV programmers to a plurality of descramblers. The system includes a plurality of business data processing systems, a plurality of channel control syste ...


9
Woo H Paik, David Grubb III, David E Charlton: Dynamically responsive CATV system with shared fiber optic link. General Instrument Corporation, Edward W Callan, August 4, 1992: US05136411 (139 worldwide citation)

A CATV system uses a single single-mode optical fiber for transmitting a composite optical signal containing television signals in different frequency channels for a plurality of subscriber terminals from a headend terminal to a distribution terminal, and converts the transmitted signals at the dist ...


10
Woo H Paik, Jerrold A Heller, Gordon K Walker: Digital audio scrambling system with error conditioning. M A COM Linkabit, Edward W Callan, August 26, 1986: US04608456 (125 worldwide citation)

In the scrambling system, an analog audio signal is converted into a digital signal to provide a sequence of digital signal samples corresponding to the analog audio signal. Each digital signal sample is compressed to provide compressed signal samples having a sign bit, three exponent bits and seven ...