Method for simulcrypting scrambled data to a plurality of conditional access devices

• US 7,702,589 B2
• Filed: 07/30/2002
• Issued: 04/20/2010
• Est. Priority Date: 11/09/1999
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Candelore, Brant L.
• Primary Examiner(s): Hewitt, II, Calvin L
• Assistant Examiner(s): Winter, John M
• Application Number:
  US10/209,341
• Publication Number:
  US 20020188567A1
• Time in Patent Office: 2,821 Days
• Field of Search: 705/55, 725/1, 725/25, 380/201
• US Class Current: 705/55
• CPC Class Codes: G06F 21/6218 to a system of files or objects, e.g. local or distributed file system or database
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/4408 involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
• 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 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• 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 accordance with one embodiment, a method for storing a normal scrambled digital program is provided. The method includes receiving a scrambled program, and receiving a plurality of access requirements. Each access requirement can descramble the scrambled program. The method also includes selecting at least one of the access requirements, and storing the scrambled program and the selected requirement.

Claims

1. A method comprising:

receiving data by a first conditional access unit, the data including scrambled content, a scrambled first control word and a scrambled second control word, wherein the first and second control words correspond to the first conditional access unit and a second conditional access unit, respectively;

descrambling the first control word by the first conditional access unit;

producing a plurality of data streams by descrambling the scrambled content from the data by the first conditional access unit using the first control word in the unscrambled format, wherein the plurality of data streams comprise a first data stream comprising the descrambled content and a scrambled second data stream comprising the scrambled content and the second scrambled control word;

sending the descrambled content from the first data stream to a display device while sending the second data stream to a storage device, by the first conditional access unit;

retrieving the second data stream from the storage device, retrieving the scrambled second control word from the second data stream and recovering the second control word in an unscrambled format by descrambling the second control word, by the second conditional access unit; and

retrieving by the second conditional access unit the content from the second data stream by descrambling the scrambled content using the second control word in the unscrambled format.

2. The method of claim 1, wherein the retrieving and descrambling of the scrambled data by the second conditional access unit occurs later in time than the descrambling of the scrambled data by the first conditional access unit.

3. The method of claim 1 wherein descrambling of the first control word and the descrambling of the second control word are performed using at least one key either delivered along with the scrambled data or stored within the first conditional access unit.

4. The method of claim 1, wherein the first control word is different than the second control word.

5. An apparatus comprising:

a receiver receiving data by a first conditional access unit, the data including scrambled content, a scrambled first control word and a scrambled second control word, wherein the first and second control words correspond to the first conditional access unit and a second conditional access unit, respectively;

a first descrambler descrambling the first control word and producing a plurality of data streams by descrambling the scrambled content from the data using the first control word in the unscrambled format, wherein the plurality of data streams comprise a first data stream comprising the descrambled content and a scrambled second data stream comprising the scrambled content and the second scrambled control word;

means for sending the descrambled content from the first data stream to a display device while sending the second data stream to a storage device, by the first conditional access unit;

a second descrambler retrieving the second data stream from the storage device, retrieving the scrambled second control word from the second data stream and recovering the second control word in an unscrambled format by descrambling the second control word; and

means for retrieving by the second conditional access unit the content from the second data stream by descrambling the scrambled content using the second control word in the unscrambled format.

6. The apparatus of claim 5, wherein the second descrambler retrieves the second access key and the scrambled data from the means for recording.

7. A computer readable medium containing instructions which, when executed by a processing system, cause the system to perform:

receiving data by a first conditional access unit the data including scrambled content;

producing a plurality of data streams by descrambling the scrambled content by the first conditional access unit using a first access key, the first access key corresponding to the first conditional access unit, wherein the plurality of data streams comprise a first data stream comprising the descrambled content and a scrambled second data stream comprising the scrambled content;

sending the descrambled content from the first data stream to a display device while sending the second data stream to a storage device, by the first conditional access unit;

retrieving a second access key by a second conditional access unit, the second access key corresponding to the second conditional access unit; and

retrieving by the second conditional access unit the content from the second data stream by descrambling the scrambled content using the second access key.

8. The medium of claim 7 wherein the first conditional access unit is adapted to descramble the scrambled content in real-time.

9. The medium of claim 7 wherein the first conditional access unit descrambles the scrambled content during a first time period, and the second conditional access unit sending the scrambled content for storage during a second time period that is different from the first time period.

10. An apparatus comprising:

means for receiving scrambled data, the scrambled data including content;

a first conditional access unit associated with a first access key, the first conditional access unit comprises (i) means for receiving scrambled data by a first conditional access unit, the scrambled data including content, a first control word and a second control word of a plurality of control words, each of the plurality of control words corresponding to a conditional access unit, (ii) means for descrambling the first control word by the first conditional access unit to recover the first control word in an unscrambled format, (iii) means for producing a plurality of data streams by descrambling at least a portion of the scrambled data by the first conditional access unit using the first control word in the unscrambled format, wherein the plurality of data streams comprise a first data stream and a scrambled second data stream, and each of the first data stream and the scrambled second data stream includes the content, and (iv) means for outputting the content from the first data stream for display while outputting the scrambled second data stream for storage; and

a second conditional access unit including

means for retrieving the scrambled second control word by a second conditional access unit separate from the first conditional access unit and recovering the second control word in an unscrambled format by descrambling the second control word, and

means for retrieving the content from the scrambled second data stream by descrambling the content by the second conditional access unit using the second control word in the unscrambled format.

11. An apparatus comprising:

means for receiving data by a first conditional access unit the data including scrambled content, a scrambled first control word and a scrambled second control word, wherein the first and second control words correspond to the first and a second conditional access unit, respectively;

a descrambler for descrambling the first control word by the first conditional access unit;

means for producing a plurality of data streams by descrambling the scrambled content from the data by the first conditional access unit using the first control word in the unscrambled format, wherein the plurality of data streams comprise a first data stream comprising the descrambled content and a scrambled second data stream comprising the scrambled content and the second scrambled control word;

means for sending the descrambled content from the first data stream to a display device while sending the second data stream to a storage device, by the first conditional access unit;

means for retrieving the second data stream from the storage device, retrieving the scrambled second control word from the second data stream and recovering the second control word in an unscrambled format by descrambling the second control word, by the second conditional access unit; and

means for retrieving the content from the second data stream by descrambling the scrambled content using the second control word in the unscrambled format.

12. The apparatus of claim 11 wherein the means for receiving, the means for descrambling, the means for producing and the means for outputting correspond to the first conditional access unit.

13. The apparatus of claim 11, wherein the means for retrieving the scrambled content from the second data stream and the means for retrieving the content correspond to a second conditional access unit.

14. The apparatus of claim 13 wherein the first conditional access unit descrambles the scrambled content during a first time period, and the second conditional access unit descrambles the scrambled content during the second period that is different from the first period.

15. A method for controlling storage and reproduction of digital content, comprising:

receiving a digital bitstream including program data by a first conditional access unit, the program data including system information and scrambled digital content in a first scrambled format;

producing a plurality of data streams by descrambling the scrambled digital content in the first scrambled format by the first conditional access unit using a first access key, the first access key corresponding to the first conditional access unit, wherein the plurality of data streams comprise a first data stream and a second data stream, both the first data stream and the second data stream include the descrambled digital content;

outputting the descrambled digital content of the first data stream to a display device while producing a second output by re-scrambling the descrambled digital content of the second data stream in a second scrambled format;

retrieving a second access key by a second conditional access unit, the second access key corresponding to the second conditional access unit; and

retrieving by the second conditional access unit the digital content from the second data stream by descrambling the scrambled digital content in the second scrambled format using the second access key.

16. The method of claim 15, wherein the second output is based on the first output.

17. The method of claim 15, wherein the outputting of the descrambled digital content in the first scrambled format and the re-scrambling of the descrambled digital content are performed concurrently.

18. The method of claim 15 further comprising storing the second output by storing the scrambled digital content along with at least one access requirement.

19. The method of claim 15, wherein prior to descrambling the scrambled digital content, the method further comprising:

demodulating the digital bitstream to recover the program data as originally transmitted.

20. The method of claim 15, wherein the outputting of the first output and the second output is performed simultaneously.

21. The method of claim 15, wherein the receiving of the digital bitstream, comprising:

tuning a tuner to a frequency to receive the digital bitstream;

demodulating the digital bitstream; and

routing the program data of the digital bitstream to a conditional access unit upon determination that the program data includes the digital content in the scrambled format.

22. An apparatus comprising:

means for receiving a digital bitstream including program data by a first conditional access unit, the program data including system information and scrambled digital content in a first scrambled format;

a descrambler for producing a plurality of data streams by descrambling the scrambled digital content in the first scrambled format by the first conditional access unit using a first access key, the first access key corresponding to the first conditional access unit, wherein the plurality of data streams comprise a first data stream and a second data stream, both the first data stream and the second data stream include the descrambled digital content;

means for outputting the descrambled digital content of the first data stream to a display device while producing a second output by re-scrambling the descrambled digital content of the second data stream in a second scrambled format;

means for retrieving a second access key by a second conditional access unit, the second access key corresponding to the second conditional access unit; and

means for retrieving by the second conditional access unit the digital content from the second data stream by descrambling the scrambled digital content in the second scrambled format using the second access key.

23. The apparatus of claim 22 further comprising means for storage of the re-scrambled digital content.

24. The apparatus of claim 23, wherein the means for storage is a hard disk recording unit.

26. The apparatus of claim 22, further comprising:

means for demodulating the digital bitstream and for transmitting the program data in the first scrambled format to the means for descrambling if the program data includes the scrambled digital content in the first scrambled format.

25. An apparatus comprising:

a processor; and

a memory coupled to the processor, the memory storing executable instructions that, when executed by the processor, cause the processor to perform operations of;

receiving a digital bitstream including program data by a first conditional access unit, the program data including system information and scrambled digital content in a first scrambled format,

producing a plurality of data streams by descrambling the scrambled digital content in the first scrambled format by the first conditional access unit using a first access key, the first access key corresponding to the first conditional access unit, wherein the plurality of data streams comprise a first data stream and a second data stream, both the first data stream and the second data stream include the descrambled digital content,

outputting the descrambled digital content of the first data stream to a display device while producing a second output by re-scrambling the descrambled digital content of the second data stream in a second scrambled format,

retrieving a second access key by a second conditional access unit, the second access key corresponding to the second conditional access unit, and

retrieving by the second conditional access unit the digital content from the second data stream by descrambling the scrambled digital content in the second scrambled format using the second access key.