Recording apparatus, recording method, reproducing apparatus, and reproducing method

• US 7,167,561 B1
• Filed: 03/03/2000
• Issued: 01/23/2007
• Est. Priority Date: 03/03/1999
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Okaue, Takumi, Yokota, Teppei, Kihara, Nobuyuki
• Primary Examiner(s): Moise; Emmanuel L.
• Assistant Examiner(s): CALLAHAN, PAUL E
• Application Number:
  US09/674,651
• Time in Patent Office: 2,517 Days
• Field of Search: 380201-203, 380/217, 380/239, 380/269, 380/210, 380/237, 705 51- 59, 713/193, 725/31, 360/15, 360/60, 386/94, 369/30.01, 369/30.04, 369/32.01, 369/53.12, 369/47.12, 369/47.13
• US Class Current: 380/217
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/16 Program or content traceability, e.g. by watermarking
• CPC Class Codes: G06F 21/31 User authentication
• CPC Class Codes: G06F 21/445 by mutual authentication, e.g. between devices or programs
• CPC Class Codes: G06F 21/602 Providing cryptographic facilities or services
• CPC Class Codes: G06F 21/72 in cryptographic circuits
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06F 21/79 in semiconductor storage media, e.g. directly-addressable memories
• CPC Class Codes: G06F 2221/2107 File encryption
• CPC Class Codes: G06F 2221/2137 Time limited access, e.g. to a computer or data
• 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: G11B 20/00478 wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11C 16/20 Initialising; Data preset; Chip identification
• CPC Class Codes: G11C 16/22 Safety or protection circuits preventing unauthorised or accidental access to memory cells
• CPC Class Codes: G11C 2207/16 Solid state audio
• CPC Class Codes: G11C 7/16 Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters

Abstract

A recording apparatus is disclosed, that comprises a compression process means for compressing an input digital signal corresponding to a predetermined compression process and segmenting the compressed digital signal into blocks, a fixed value generating means for generating a predetermined fixed value, an adding means for adding the fixed value generated by the fixed value generating means at a predetermined timing to the blocks of the digital signal compressed by the compression process means, an encrypting means for encrypting the fixed value and the compressed digital signal added by the adding means, and a recording means for recording the fixed value and the compressed digital signal encrypted by the encrypting means to a record medium.

Claims

1. A reproducing apparatus for reproducing data in which a digital signal, to which a fixed value is added at a predetermined timing to blocks of main data, is compressed and encrypted from a recording medium, comprising:

decrypting means for decrypting the compressed and encrypted digital signal;

separating means for separating the fixed value and the compressed data from the digital signal that are decrypted by said decrypting means;

decompressing means for decompressing the compressed main data separated by said separating means;

memory means for pre-storing a fixed value;

comparing means for comparing the fixed value separated by said separating means with the fixed value stored in said memory means; and

controlling means for permitting and prohibiting the decompressing of said main data based upon the compared result of said comparing means.

2. The reproducing apparatus as set forth in claim 1, wherein the recording medium is attachable/detachable to/from the reproducing apparatus.

3. The reproducing apparatus as set forth in claim 1, wherein the recording medium is a non-volatile memory.

4. The reproducing apparatus as set forth in claim 1, wherein said memory means stores a plurality of fixed values that vary corresponding to channels,

wherein the plurality of fixed values stored in said memory means are successively compared with the fixed value separated from said separating means so as to identify a channel.

5. The reproducing apparatus as set forth in claim 1, wherein said memory means stores a plurality of fixed values that vary corresponding to compression rates,

wherein the plurality of fixed values stored in said memory means are successively compared with the fixed value separated from said separating means so as to identify a compression rate.

6. The reproducing apparatus as set forth in claim 1,

wherein the decompressing process is permitted for the compressed main data based upon the compared result in such a manner that a mute process is performed for the decompressed main data.

7. A reproducing method for reproducing data in which a digital signal, to which a fixed value is added at a predetermined timing to blocks of main data, is compressed and encrypted from a recording medium, comprising the steps of:

decrypting the compressed and encrypted digital signal;

separating the fixed value and the compressed data from the digital signal that are decrypted;

decompressing the compressed main data that is separated;

comparing the separated fixed value with a fixed value that is stored; and

permitting and prohibiting the decompressing of the main data based upon the compared result of the comparing step.

8. The reproducing apparatus as set forth in claim 7, wherein the recording medium is attachable/detachable to/from the reproducing apparatus.

9. The reproducing apparatus as set forth in claim 7, wherein the recording medium is a non-volatile memory.

10. The reproducing method as set forth in claim 7,

wherein a plurality of fixed values that vary corresponding to channels are pre-stored, and

wherein the plurality of fixed values that are pre-stored are successively compared with the fixed value separated at separating step so as to identify a channel.

11. The reproducing method as set forth in claim 7,

wherein a plurality of fixed values that vary corresponding to compression rates are pre-stored, and

wherein the plurality of fixed values that are pre-stored are successively compared with the fixed value separated at separating step so as to identify a compression rate.

12. The reproducing method as set forth in claim 7,

wherein the decompressing process is permitted for the compressed main data based upon the compared result in such a manner that a mute process is performed for the decompressed main data.