Receiving apparatus

• US 7,397,921 B2
• Filed: 07/16/2003
• Issued: 07/08/2008
• Est. Priority Date: 07/19/2002
• Status: Expired due to Fees

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ueno, Takafumi
• Primary Examiner(s): Vu; Kimyen
• Assistant Examiner(s): To; Baotran N
• Application Number:
  US10/619,524
• Publication Number:
  US 20040059911A1
• Time in Patent Office: 1,819 Days
• Field of Search: 713/165, 713/150, 713/168, 713/193, 705/51, 380240-241, 370/542
• US Class Current: 380/241
• CPC Class Codes: H04H 20/76 Wired systems
• CPC Class Codes: H04H 20/91 broadcasting computer programmes
• CPC Class Codes: H04H 60/14 Arrangements for conditional access to broadcast information or to broadcast-related services
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/2541 Rights Management protecting software against unauthorised usage in a vending or licensing environment G06F21/10; 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 21/25875 involving end-user authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• CPC Class Codes: H04N 21/26613 for generating or managing keys in general key distribution for secret or secure communication involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP] H04L9/083; network support of key management H04L63/06; key management for network security in communication control or processing H04W12/04
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• 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 21/84 Generation or processing of descriptive data, e.g. content descriptors systems specially adapted for using meta-information in broadcast systems H04H60/73
• 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

A transmission apparatus updates the encryption method in the event the encryption method is broken. The tool ID of a decryption tool for encrypted data is acquired, the presence of the tool is confirmed and the tool is then acquired and updated, and encrypted data is processed and transmitted based on rights information associated with the encrypted data.

Claims

1. A receiving apparatus, comprising:

a demultiplexer that separates a multiplexed signal containing first encrypted data into at least the first encrypted data and program-specific information;

a tool list demultiplexor that separates a tool list having a tool identification indicating a decoding tool for decrypting the first encrypted data from the multiplexed signal;

a control graph demultiplexor that separates a control graph indicating an instantiated location of the decoding tool in the receiving apparatus from the multiplexed signal;

a rights information demultiplexor that demultiplexes rights information for the first encrypted data from the multiplexed signal, the rights information specifying at least one of rights for a permitted number of accesses and rights for editing in the receiving apparatus;

a first controller that acquires a tool according to the tool identification acquired from the tool list, and instantiating the tool according to the control graph;

a first rights manager that processes the first encrypted data according to the rights information;

a second rights manager that separates the rights information into first rights information and second rights information; and

a multiplexing adjustor that modifies the rights information in the multiplexed signal, and that outputs a revised multiplexed signal,

wherein the revised multiplexed signal is output to a second receiving apparatus in accordance with a request signal from the second receiving apparatus.

2. The receiving apparatus according to claim 1, further comprising:

a temporary storage that temporarily stores the first encrypted data; and

a file manager that deletes from the temporary storage the first encrypted data after a playback permit recorded in the rights information is expired.

3. The receiving apparatus according to claim 1,

wherein the rights manager sends status information denoting a processing state of the first encrypted data.

4. The receiving apparatus according to claim 1, further comprising:

a rights manager that separates the rights information into first rights information and second rights information;

wherein the second rights information and multiplexed signal are output to a second receiving apparatus according to a request signal from the second receiving apparatus.

5. The receiving apparatus according to claim 1,

wherein the rights manager receives data indicating how the first encrypted data was processed by a second receiving apparatus, and sends status information describing processing by the receiving apparatus and the second receiving apparatus.

6. The receiving apparatus according to claim 1, further comprising:

a converter that converts the first encrypted data to second encrypted data; and

a remultiplexer that remultiplexes the second encrypted data with second rights information.

7. The receiving apparatus according to claim 1,

wherein the first encrypted data is processed according to the first rights information.

8. The receiving apparatus according to claim 1, further comprising:

a temporary storage that temporarily stores the first encrypted data; and

a file manager that deletes the first encrypted data from the temporary storage after sending it to a second receiving apparatus.

9. The receiving apparatus according to claim 1, further comprising:

a video decoder that extracts and decodes video data from the multiplexed signal.

10. The receiving apparatus according to claim 1, further comprising:

an audio decoder that extracts and decodes audio data from the multiplexed signal.

11. The receiving apparatus according to claim 3,

wherein the processing state in the receiving apparatus comprises the permitted number of accesses, editing allowed information and editing prohibited information.

12. The receiving apparatus according to claim 5,

wherein a processing state in the second receiving apparatus comprises the permitted number of accesses, editing allowed information and editing prohibited information.