Critical packet partial encryption

Critical packet partial encryption

An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit multiple manufacturer's set-top boxes (36 and 136) w...

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Hauptverfasser: CANDELORE, BRANT L, UNGER, ROBERT ALLAN
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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creator CANDELORE, BRANT L
UNGER, ROBERT ALLAN
description An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit multiple manufacturer's set-top boxes (36 and 136) within a single system. In one embodiment, only critical packets such as those carrying a payload incorporating packetized elementary stream header information is encrypted. By only encrypting a portion of the program, dramatically less bandwidth is consumed that the alternative of multiple encryption of all program data, thus permitting a larger number of multiple conditional access systems in a single cable television system.
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A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit multiple manufacturer's set-top boxes (36 and 136) within a single system. In one embodiment, only critical packets such as those carrying a payload incorporating packetized elementary stream header information is encrypted. 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subjects BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
title Critical packet partial encryption
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