Recorder/Reproducer and Content Data Protection System

• US 20080239909A1
• Filed: 03/11/2005
• Published: 10/02/2008
• Est. Priority Date: 04/20/2004
• Status: Active Grant

• Current Assignee: TRW Automotive GmbH (Apollo Global Management, Inc.), Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nakano, Toshihisa, Ito, Yoshikatsu, Ohmori, Motoji, Yokota, Kaoru, Takahashi, Jun, Harada, Shunji, Miyazaki, Masaya
• Granted Patent: US 7,856,168 B2
• Time in Patent Office: Days
• US Class Current: 369/53.21
• 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 20/00927 wherein said defects or errors are generated on purpose, e.g. intended scratches
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2516 Hard disks
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 2220/2575 DVD-RAMs
• CPC Class Codes: G11B 2220/455 said record carriers being in one device and being used as primary and secondary/backup media, e.g. HDD-DVD combo device, or as source and target media, e.g. PC and portable player
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

The recorder/reproducer (101), when moving a first content data, writes a second content data, which is obtained by re-coding the first content data recorded in a first recording medium, into a second recording medium instead of the first content data, writes one or more first partial information extracted from the first content data into the second recording medium, and makes the first content data irreproducible, using one or more first invalidated partial information having one-to-one correspondence with the extracted one or more first partial information. When restoring the first content data, it makes the irreproducible first content data reproducible, using the one or more first partial information recorded in the second recording medium.

Claims

1. A recorder/reproducer, comprising:

a content data moving unit operable to;

write a second content data into a second recording medium that is different from a first recording medium, the second content data being obtained by re-coding a first content data recorded in the first recording medium;

write a first partial information extracted from the first content data into the second recording medium; and

make the first content data irreproducible, using a first invalidated partial information corresponding to the extracted first partial information; and

a content data restoration unit operable to make the irreproducible first content data reproducible, using the first partial information recorded in the second recording medium.

2. The recorder/reproducer according to claim 1, further comprising

a content data obtainment unit operable to:

accumulate the first content data;

generate the second content data from the first content data; and

make the second content data irreproducible, using a second invalidated partial information that is generated based on the first partial information extracted from the first content data,

wherein said content data moving unit, when writing the second content data into the second recording medium, is operable to make the irreproducible second content data reproducible, using a second partial information corresponding to the first partial information extracted from the first content data.

3. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to generate the first invalidated partial information corresponding to the extracted first partial information, and to make the first content data irreproducible by replacing the first partial information included in the first content data by the generated first invalidated partial information, and

said content data restoration unit is operable to make the first content data reproducible by replacing the first invalidated partial information included in the irreproducible first content data by the first partial information recorded in the second recording medium.

4. The recorder/reproducer according to claim 3,

wherein said content data moving unit is operable to write, into the second recording medium, the first partial information extracted from the first content data, before replacing the first partial information included in the first content data by the generated first invalidated partial information.

5. The recorder/reproducer according to claim 3,

wherein said content data moving unit is operable to replace the first partial information included in the first content data by the generated first invalidated partial information, while writing, into the second recording medium, the second content data that is obtained by re-coding the first content data.

6. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to:

generate the second invalidated partial information corresponding to the extracted second partial information, and make the second content data irreproducible by replacing the second partial information included in the generated second content data by the generated second invalidated partial information; and

when making the irreproducible second content data reproducible, generate the second partial information corresponding to the extracted first partial information, and make the irreproducible second content data reproducible by replacing the second invalidated partial information included in the irreproducible second content data by the generated second partial information.

7. The recorder/reproducer according to claim 3,

wherein said content data moving unit is operable to replace the first partial information included in the first content data by the generated first invalidated partial information, while replacing the second invalidated partial information included in the irreproducible second content data by the generated second partial information.

8. The recorder/reproducer according to claim 1, further comprising

an accumulation unit operable to accumulate the first content data segmented into blocks,

wherein said content data moving unit is operable to extract, from the blocks, a predetermined block as the first partial information.

9. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract one of the following as the first partial information, in the case where the first content data is content data multiplexed as a transport stream of MPEG-2 Systems:

(a) a part of data of a TS packet constituting the first content data;

(b) a part of data of a PES packet included in a payload of a TS packet constituting the first content data;

(c) a part of data of a TS packet including a non-reference frame, out of TS packets constituting the first content data; and

(d) a part of data of a TS packet in which “

indicator”

of a PES packet indicates “

1”

, the PES packet being included in the TS Packet constituting the first content data.

10. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract, as the first partial information, a part of data of a PS packet constituting the first content data, in the case where the first content data is content data multiplexed as a program stream of MPEG-2 Systems.

11. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract one of the following as the first partial information, in the case where the first content data is content data that is coded in accordance with MP4:

(a) a part of data of information indicating “

Sample Size Boxes”

included in the first content data; and

(b) a part of data of information indicating “

Sample to Chunk Boxes”

included in the first content data.

12. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract, as the first partial information, a part of data of information indicating “

Slice Header”

included in the first content data, in the case where the first content data is content data that is coded in accordance with MPEG-2Video.

13. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract one of the following as the first partial information, in the case where the first content data is content data that is coded in accordance with MPEG-4Video:

(a) a part of data of information indicating “

Video Object Place Header”

included in the first content data; and

(b) a part of data of information indicating “

Video Packet Header”

included in the first content data.

14. The recorder/reproducer according to claim 1,

wherein said content data moving unit is operable to extract, as the first partial information, a part of data of information indicating “

RTSPHeader”

included in the first content data, in the case where the first content data is content data that is coded in accordance with MPEG-4AVC (ITU-T H.264).

15. The recorder/reproducer according to claim 2, further comprising

an accumulation unit operable to accumulate the second content data segmented into blocks,

wherein said content data moving unit is operable to extract, from the blocks, a predetermined block as the second partial information.

16. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract one of the following as the second partial information, in the case where the second content data is content data multiplexed as a transport stream of MPEG-2 Systems:

(a) a part of data of a TS packet constituting the second content data;

(b) a part of data of a PES packet included in a payload of a TS packet constituting the second content data;

(c) a part of data of a TS packet including a non-reference frame, out of TS packets constituting the second content data; and

(d) a part of data of a TS packet in which “

indicator”

of a PES packet indicates “

1”

, the PES packet being included in the TS Packet constituting the second content data.

17. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract, as the second partial information, a part of data of a PS packet constituting the second content data, in the case where the second content data is content data multiplexed as a program stream of MPEG-2 Systems.

18. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract one of the following as the second partial information, in the case where the second content data is content data that is coded in accordance with MP4:

(a) a part of data of information indicating “

Sample Size Boxes”

included in the second content data; and

(b) a part of data of information indicating “

Sample to Chunk Boxes”

included in the second content data.

19. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract, as the second partial information, a part of data of information indicating “

Slice Header”

included in the second content data, in the case where the second content data is content data that is coded in accordance with MPEG-2Video.

20. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract one of the following as the second partial information, in the case where the second content data is content data that is coded in accordance with MPEG-4Video:

(a) a part of data of information indicating “

Video Object Place Header”

included in the second content data; and

(b) a part of data of information indicating “

Video Packet Header”

included in the first content data.

21. The recorder/reproducer according to claim 2,

wherein said content data moving unit is operable to extract, as the second partial information, a part of data of information indicating “

RTSPHeader”

included in the second content data, in the case where the second content data is content data that is coded in accordance with MPEG-4AVC (ITU-T H.264).

22. A recording/reproduction method comprising:

a content data moving step of;

writing a second content data into a second recording medium that is different from a first recording medium, the second content data being obtained by re-coding a first content data recorded in the first recording medium;

writing a first partial information extracted from the first content data into the second recording medium; and

making the first content data irreproducible, using a first invalidated partial information corresponding to the extracted first partial information; and

a content data restoration step of making the irreproducible first content data reproducible, using the first partial information recorded in the second recording medium.

23. A recording/reproduction program causing a computer system to execute:

a content data moving step of;

writing a second content data into a second recording medium that is different from a first recording medium, the second content data being obtained by re-coding a first content data recorded in the first recording medium;

writing a first partial information extracted from the first content data into the second recording medium; and

making the first content data irreproducible, using a first invalidated partial information corresponding to the extracted first partial information; and

a content data restoration step of making the irreproducible first content data reproducible, using the first partial information recorded in the second recording medium.

24. A semiconductor device comprising:

a content data moving unit operable to;

write a second content data into a second recording medium that is different from a first recording medium, the second content data being obtained by re-coding a first content data recorded in the first recording medium;

write a first partial information extracted from the first content data into the second recording medium; and

make the first content data irreproducible, using a first invalidated partial information corresponding to the extracted first partial information; and

a content data restoration unit operable to make the irreproducible first content data reproducible, using the first partial information recorded in the second recording medium.