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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0219648 (1994-03-29) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 279 인용 특허 : 0 |
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
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.
In a packet-based multiplexed communications system wherein a plurality of different elementary streams are each segmented and inserted into respective transport packets that are then multiplexed to form a single transport stream for transmission to a remote location, and wherein the elementary stre
In a packet-based multiplexed communications system wherein a plurality of different elementary streams are each segmented and inserted into respective transport packets that are then multiplexed to form a single transport stream for transmission to a remote location, and wherein the elementary streams are separately and uniquely encrypted prior to transmission, and wherein encryption related information specific to each elementary stream is generated and must be provided to the remote location for decryption purposes, and further wherein different combinations of elementary streams define a plurality of different programs, a method of providing the encryption related information for each elementary stream to the remote location comprising the steps of: a) for each elementary stream, inserting the encryption related information for that elementary stream into a respective sequence of transport packets; b) generating, as part of a program map table that specifies, for each of said different programs, which of said elementary streams comprise said each program, a table that specifies, for each elementary stream of each program, which of the transport packets generated in step (a) carry the encryption related information for that elementary stream; and c) transmitting the program map table and the transport packets that carry the encryption related information for each elementary stream to the remote location as part of the transport stream along with the transport packets that carry the encrypted data of each elementary stream, whereby a decoder at the remote location can access the program map table to identify which elementary streams comprise a program selected by a user at that location, as well as to identify which transport packets transmitted in step (c) carry the encryption related information for the elementary streams of the selected program.
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