1
William Frezza, Robert Simons, Richard Westerfer: Security arrangement for downloadable cable television converters. General Instrument Corporation, Barry R Lipsitz Esq, December 8, 1987: US04712239 (168 worldwide citation)

A method and apparatus prevent unauthorized programming viewing via a downloadable cable television converter. A booter checksum is computed from data contained in a downloaded booter image. A valid checksum is extracted from tag data associated with a scrambled program signal transmitted on the cab ...


2
Frezza William, Westerfer Richard, Simons Robert: Dispositif de surete pour convertisseurs de television par cable, Security arrangement for downloadable cable television converters. General Instrument Corporation, RIDOUT & MAYBEE, April 24, 1990: CA1268247

ABSTRACT A method and apparatus prevent unauthorizedprogramming viewing via a downloadable cabletelevision converter. A booter checksum is computedfrom data contained in a downloaded booter image. Avalid checksum is extracted from tag data associatedwith a scrambled program signal transmitted on the ...