초록 ▼

Apparatus in a receiver, for processing transmitted entitlement control information, includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload header and a remaining payload of entitlement data. Respective payload headers include group

Apparatus in a receiver, for processing transmitted entitlement control information, includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload header and a remaining payload of entitlement data. Respective payload headers include groups of bytes which are coded in a manner to allow or disallow the respective receiver from processing the entitlement data. A conditional access filter preprogrammed with a subscriber specific conditional access codeword examines respective byte groupings of the conditional access header for a match with the subscriber specific conditional access codeword. Only if a match occurs is the processor permitted to process the entitlement data. The entitlement data is thereafter utilized to generate decryption keys for descrambling portions of the transmitted signal.

대표청구항 ▼

Apparatus in a packet signal receiver for processing a packet signal containing entitlement data included in signal packets having a header identifying such packets as containing entitlement data, and having a payload containing said entitlement data and a payload header including a plurality of adj

Apparatus in a packet signal receiver for processing a packet signal containing entitlement data included in signal packets having a header identifying such packets as containing entitlement data, and having a payload containing said entitlement data and a payload header including a plurality of adjacently concatenated N-byte conditional access codes, said apparatus comprising: means for applying said packet signal; a transport processor, responsive to said packet signal, for identifying signal packets containing entitlement data, and extracting entitlement data payloads from identified packets; memory means for storing extracted entitlement data payloads; and a conditional access filter arranged to examine payload header data of extracted entitlement data payloads for subscriber specific or subscriber group N-byte conditional access codes, including a comparator, for comparing, said payload header data including said plurality of adjacently concatenated N-byte conditional access codes, in exclusive N-byte groups, with an N-byte conditional access code stored in said receiver, and if a match is made of said N-byte conditional access code with any of said exclusive N-byte groups, generating an enable signal to write said entitlement data to said memory means.