Data recording method and apparatus, data record medium and data reproducing method and apparatus

• US 6,445,795 B1
• Filed: 09/14/1998
• Issued: 09/03/2002
• Est. Priority Date: 06/30/1995
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Osawa, Yoshitomo, Sako, Yoichiro, Kurihara, Akira, Owa, Hideo, Kawashima, Isao
• Primary Examiner(s): Hayes, Gail
• Assistant Examiner(s): Seal, James
• Application Number:
  US09/152,947
• Time in Patent Office: 1,450 Days
• Field of Search: 380/3, 380/4, 380/9, 380/201, 360/48, 360/49, 360/50, 360/51, 428/64.2, 428/64.3, 428/64.4, 369/84, 705/51, 705/54, 705/56-59
• US Class Current: 380/201
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• 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 20/00115 wherein the record carrier stores a unique medium identifier
• CPC Class Codes: G11B 20/00195 using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00253 wherein the key is stored on the record carrier
• CPC Class Codes: G11B 20/00318 the key being stored in the TOC
• CPC Class Codes: G11B 20/00333 the key being stored in header data, e.g. in sector headers
• CPC Class Codes: G11B 20/00347 wherein the medium identifier is used as a key
• CPC Class Codes: G11B 20/00507 wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis
• CPC Class Codes: G11B 20/00557 wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00637 said management data being address data
• CPC Class Codes: G11B 20/0071 involving a purchase action
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1833 by adding special lists or symbols to the coded information G11B20/1806, G11B20/1866 take precedence
• CPC Class Codes: G11B 20/1866 by interleaving G11B20/1809 takes precedence
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/235 Multilayer discs, i.e. multiple recording layers accessed from the same side
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/3027 : used signal is digitally coded
• CPC Class Codes: G11B 27/329 : on a disc [VTOC]
• CPC Class Codes: H04N 2005/91364 : the video signal being scrambled
• CPC Class Codes: H04N 5/85 : on discs or drums
• CPC Class Codes: H04N 5/913 : for scrambling ; for copy protection

Abstract

An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit 15, an error correction encoding circuit 16, a modulation circuit 18 and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only the key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure.

Claims

1. A data recording method comprising error correction coding input digital data and recording the resulting data on a record medium, wherein at least part of said input digital data is ciphered at approximately the time of said error correction coding by performing data conversion thereon using key information for ciphering, and the amount of data converted by said data conversion is set below a predetermined limit to ensure a high probability of successful error correction during reproduction of said digital data from said record medium.

2. A data recording method in which input data is signal processed for recording by a recording device and is recorded in a pre-set recording area on a record medium, comprising the steps of:

ciphering the data using pre-set key information, and using, as at least a part of said pre-set key information, information recorded in an area other than said pre-set recording area on said record medium comprised of at least one of identification information proper to the record medium, identification information proper to the recording device, identification information proper to the device for producing the record medium, producer/dealer identification information, territory information and identification information supplied from outside.

6. The method as claimed in claim 2, wherein said information recorded in an area other than said pre-set recording area comprises identification information proper to the recording device.

7. The method as claimed in claim 2, wherein said information recorded in an area other than said pre-set recording area comprises identification information proper to the device for producing the record medium.

8. The method as claimed in claim 2, wherein said information recorded in an area other than said pre-set recording area comprises producer/dealer identification information.

9. The method as claimed in claim 2, wherein said information recorded in an area other than said pre-set recording area comprises territory information.

10. The method as claimed in claim 2, wherein said information recorded in an area other than said pre-set recording area comprises externally supplied identification information.

3. A data record medium on which there is recorded a signal obtained by arranging input digital data into sectors in terms of a pre-set data volume as a unit, the data thus arranged into sectors is processed with scrambling for randomizing the data to eliminate repetitive byte patterns, in which at least one of an initial value of a shift register used for scrambling, and a generating polynomial controlling feedback during scrambling is changed responsive to key information for ciphering, a header is appended to the resulting scrambled data, and the resulting data having the header is processed with error correction coding and modulated in accordance with a pre-set modulation system.

4. A data recording method comprising error correction coding input digital data and recording the resulting data on a record medium, wherein at least part of said input digital data is ciphered at approximately the time of said error correction coding by performing data conversion thereon using key information for ciphering, wherein said data conversion is performed after said parity bits are added to said input data by said error correction coding, at a time just prior to a data re-arraying operation of said error correction coding.

5. A data recording method comprising error correction coding input digital data and recording the resulting data on a record medium, wherein at least part of said input digital data is ciphered at approximately the time of said error correction coding by performing data conversion thereon using key information for ciphering, a first part of said data conversion is performed on said input digital data just prior to error correction coding thereof, and a second portion of said data conversion is performed after parity bits are added to said input digital data via said error correction coding.