Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device

• US 20070143784A1
• Filed: 09/15/2006
• Published: 06/21/2007
• Est. Priority Date: 06/11/1997
• Status: Active Grant

• Current Assignee: Norio Wakatsuki, Tatsuya Kubota
• Original Assignee: Norio Wakatsuki, Tatsuya Kubota
• Inventors: Wakatsuki, Norio, Kubota, Tatsuya
• Granted Patent: US 7,769,053 B2
• Time in Patent Office: Days
• US Class Current: 725/31
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/23895 involving multiplex stream encryption
• CPC Class Codes: H04N 21/23897 by partially encrypting, e.g. encrypting only the ending portion of a movie
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43853 involving multiplex stream decryption arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 21/4623 Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 5/50 Tuning indicators; Automatic tuning control
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 7/1675 : Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets, a program distribution system, a program transmission system, a pay broadcast system, a program transmission method, a conditional access system, and a data reception device according to the present invention, by generating a scramble key Ks corresponding to one or more data elements among the plurality of data elements constituting a program and by scrambling each data element, an audience can subscribe for each data element.

Claims

1. A data multiplexing device which multiplexes and transmits transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets, said device comprising:

a scramble key generation means for generating a scramble key corresponding to each of said data elements, and

a scramble means for scrambling said corresponding transport stream packet of data element by using a scramble key generated by said scramble key generation means.

2. A data multiplexing device according to claim 1, wherein said scramble key generation means generates a scramble key corresponding to one or more data elements among said plurality of data elements constituting said program.

3. A data multiplexing device according to claim 1, wherein said plurality of data elements constituting said program are video data, main audio data, subaudio data, and private data.

4. A data multiplexing device according to claim 1, wherein said scramble means scrambles each of said multiplexed transport stream packets by using said scramble key corresponding to said transport stream packet.

5. A data multiplexing device according to claim 4, wherein said scramble means searches for each scramble key for scrambling said transport stream packet by using a correspondence table which shows packet identification codes for said transport stream packets and their corresponding scramble keys.

6. A data multiplexing device according to claim 4, wherein said data multiplexing device comprises a first encryption means for enciphering said scramble key with a work key and multiplexes said enciphered scramble key with said transport stream packet to transmit it.

7. A data multiplexing device according to claim 6, wherein said data multiplexing device comprises a second encryption means for enciphering said work key with a master key and multiplexes said enciphered work key with said transport stream packet to transmit it.

8. A data multiplexing device comprising:

a plurality of buffer memories which store a plurality of packet data strings constituting a plurality of data elements,

a multiplexing means which has a switch means for switching said buffer memories and which time-division multiplexes said plurality of packet data strings to provide an output by sequentially time-division switching said buffer memories with said switch means, and

a switch control means which selects, according to an input rate for said packet data strings, said plurality of buffer memories switchable by said switch means.

9. A data multiplexing device according to claim 8, wherein said switch control means switchably controls said switch means to exclude a buffer memory for buffering lower priority information among said plurality of buffer memories, when said input rate is higher than a reference rate.

10. A data multiplexing device according to claim 9, wherein said switch control means determines packet data containing EMM data to be lower priority information and excludes a buffer memory for buffering said packet data containing said EMM data among said switchable buffer memories.

11. A data multiplexing device according to claim 10, wherein said switch control means excludes, in addition to said buffer memory for buffering said packet data containing said EMM data, a buffer memory for buffering packet data containing EPG data among said switchable buffer memories, when said input rate is still higher than said reference rate after said buffer memory for buffering said packet data containing said EMM data has been excluded.

12. A program distribution system for distributing a program consisting of a plurality of data elements, said program distribution system comprising:

a subscriber management system for managing subscribers'"'"' subscriptions for each program or data element,

a subscriber authorization system for generating a scramble key to be used for descrambling said data elements contained in said program for each of said data elements, and

a multiplexer system comprising;

an encoding system for encoding each of said data elements contained in said program to generate encoded streams consisting of encoded data elements for each program,

a multiplexing means for multiplexing said encoded streams generated for each program by said encoding system, and

a scramble means for selectively scrambling each of said encoded data elements contained in said multiplexed stream based on said scramble key generated by said subscriber authorization system.

13. A program distribution system according to claim 12, wherein said subscriber management system generates a work key for enciphering said scramble key, and

said subscriber management system supplies to said subscriber authorization system a subscriber identification number for identifying said subscriber and said work key as EMM data.

14. A program distribution system according to claim 13, wherein said subscriber authorization system comprises a first encryption means for enciphering said work key supplied as said EMM data with a master key to provide an enciphered work key as an output.

15. A program distribution system according to claim 14, wherein said subscriber authorization system supplies to said multiplexer system said enciphered work key enciphered by said first encryption means and said subscriber identification number as enciphered EMM data.

16. A program distribution system according to claim 15, wherein said subscriber authorization system supplies to said multiplexer system a work key identification number for identifying said enciphered work key enciphered by said first encryption means and said scramble key as ECM data.

17. A program distribution system according to claim 16, wherein said subscriber authorization system comprises a work key table which shows the correspondence between said work key and a work key identification number for identifying said work key, and

said subscriber authorization system supplies said work key table to said multiplexer system.

18. A program distribution system according to claim 17, wherein said multiplexer system comprises a second encryption means for enciphering said scramble key contained in said ECM data with said work key to provide an enciphered scramble key as an output.

19. A program distribution system according to claim 18, wherein said work key used by said second encryption means for enciphering said scramble key is not said enciphered work key contained in said EMM data but an unenciphered work key obtained from said work key table supplied by said subscriber authorization system.

20. A program distribution system according to claim 19, wherein said second encryption means obtains a work key from said work key identification number contained in said ECM data by referencing said work key table supplied by said subscriber authorization system,

said second encryption means enciphers said scramble key contained in said ECM data by using said work key obtained from said work key table, and

said second encryption means provides said enciphered scramble key enciphered by said second encryption means as enciphered ECM data.

21-122. -122. (canceled)