Methods for providing conditional access information to decoders

Multiplex communications – Wide area network – Packet switching

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348474, 380 10, 380 43, H04K 100, H04L 918

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active

054208661

ABSTRACT:
In a packet-based multiplexed communications system, a method of providing different sets of conditional access information to a remote location comprises the steps of: (a) for each different set of conditional access information, inserting the set of conditional access information into a respective sequence of transport packets and assigning a unique packet ID to the transport packet of that sequence; (b) generating a table that specifies, for each of the different sets of conditional access information, the packet ID of the transport packets that carry that set of conditional access information; and (c) transmitting the table and the transport packets that carry each of the different sets of conditional access information to the remote location along with other information bearing transport packets. A decoder at the remote location can employ the transmitted table to identify and extract the transport packets that carry a selected one of the sets of conditional access information.

REFERENCES:
patent: 5319707 (1994-06-01), Wasilewski et al.
Wasilewski, A., "Universal Multi-Program Multiplex and Transport for MPEG-2 Systems", International Organization for Standardization, ISO/IEC JTC1/SC29/WG11 MPEG 93/170, (Jan. 1993).
Wasilewski, A., "Requirements and Method for High-Level Multiplexing of MPEG and Other Digital Service Bitstreams with Universal Transport Layer", International Organization for Standardization, ISO/IEC JTC1/SC2/WG11 MPEG 92/754, (Nov. 1992).
Wasilewski, A., "An MPEG-2 Multi-Program Multiplex Syntax", International Organization for Standardization, ISO/IEC JTC1/SC29/WG11 MPEG 93/173, (Jan. 1993).

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