Reproducing apparatus and reproducing method

• US 7,092,911 B2
• Filed: 03/24/2000
• Issued: 08/15/2006
• Est. Priority Date: 03/26/1999
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yamada, Eiichi, Okaue, Takumi, Yokota, Teppei, Kihara, Nobuyuki
• Primary Examiner(s): HEWITT II, CALVIN L
• Application Number:
  US09/534,744
• Publication Number:
  US 20030120604A1
• Time in Patent Office: 2,335 Days
• Field of Search: 705/1, 705/50, 705/51, 705/52, 705/54, 705/57, 705/58, 705/59
• US Class Current: 705/57
• 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 21/445 by mutual authentication, e.g. between devices or programs
• CPC Class Codes: G06Q 30/0283 Price estimation or determination
• 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 20/00746 wherein the usage restriction can be expressed as a specific number
• CPC Class Codes: G11C 2207/16 Solid state audio deprecated, only for historical reasons, G06F3/16, G11B
• 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 reproducing apparatus for reproducing data from a record medium having a program area and a management area, the program area being used for recording a plurality of files, the management area being used for managing forging prohibition information against a particular file recorded in the program area is disclosed, the apparatus comprising a calculating means for calculating the forging prohibition information managed in the management area of the record medium whenever a file recorded in the recorde medium is reproduced, a comparing means for comparing a value calculated by the calculating means corresponding to a former reproduction command with a value calculated by the calculating means corresponding to a current reproduction command, and a controlling means for permitting the file corresponding to the current reproduction command to be reproduced when the value calculated corresponding to the former reproduction command is the same as the value calculated corresponding to the current reproduction command as the result of the comparing means.

Claims

1. A reproducing apparatus for reproducing data from a record medium having a program area and a management area, the program area being used for recording a plurality of files, the management area being used for recording management data of a particular file recorded in the program area, the apparatus comprising:

calculating means for generating a group integrity check value for said file when said file is reproduced;

storing means for storing said group integrity check value generated by said calculating means;

comparing means operable when a record medium is re-attached to said reproducing apparatus for reproducing data,

for comparing a former group integrity check value, associated with the record medium and generated by said calculating means at a time when a former reproduction command was performed, with a current group integrity check value generated by said calculating means at the time when a current reproduction command is performed,

and for comparing a value of at least one of plural individual parameters on the re-attached record medium with a corresponding value of that parameter stored in the reproducing apparatus; and

controlling means for permitting a file corresponding to the current reproduction command to be reproduced, and transferred to the record medium when said comparing means determines that said former group integrity check value is the same as said current group integrity check value, and that said value of the at least one individual parameter coincides with the corresponding value of that parameter stored in the reproducing apparatus;

wherein said group integrity check value is generated from a group of management information of a plurality of files;

wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and

wherein said at least one individual parameter is a reproduction start time value stored on the record medium.

2. The reproducing apparatus as set forth in claim 1, wherein the group of management information is at least the number of reproduction times and/or a reproduction limitation value.

3. The reproducing apparatus as set forth in claim 1, wherein the group of management information is file attribute information, reproduction limitation flag, reproduction start date/time, reproduction expiration date/time, number of file reproduction times, number of reproduction permission times, copy control flag, and number of high speed digital copy permission times.

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

wherein each of the files contains encryption key information, and

wherein said calculating means calculates both the encryption key information contained in a file corresponding to the current clock value and group of management information using the predetermined function.

5. The reproducing apparatus as set forth in claim 1, wherein each of the files contains encryption key information, wherein when a particular file is edited, new encryption key information is generated, and wherein said calculating means calculates the new encryption key information and group of management information using the predetermined function.

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

an inner timer, wherein said controlling means prohibits the reproducing operation when the date/time information counted by the inner timer matches the reproduction start date/time.

7. The reproducing apparatus as set forth in claim 1, wherein the management area contains the date/time information counted by the inner timer, wherein said calculating means calculates the date/time information using the predetermined function, wherein said comparing means compares the value calculated by said calculating means corresponding to the former reproduction command with that corresponding to the current reproduction command, and wherein said controlling means permits the reproducing operation when the value calculated corresponding to the former reproduction command matches the value calculated corresponding to the current reproduction command as the result of said comparing means.

8. The reproduction apparatus as set forth in claim 7, wherein said date/time information indicates last recording date/time information and is included in reproduction management information which manages a file reproduction order.

9. The reproduction apparatus as set forth in claim 1, wherein said comparing means and said storing means for storing said group integrity check value is located within one controller.

10. The reproduction apparatus as set forth in claim 1, wherein an integrity check value for each file of said plurality of files is stored in said record medium.

11. The reproduction apparatus as set forth in claim 10, wherein said record medium is a memory card having a controller and memory for storing files, said group integrity check value is stored in said controller, and said integrity check values corresponding to respective ones of said plurality of files are stored in said memory.

12. The reproduction apparatus as set forth in claim 1, wherein said comparing means compares said former group integrity check value and said current group integrity check value when a record medium connected to said reproducing apparatus.

13. A reproducing apparatus for reproducing a file from a record medium on which a main file, a reproduction management file and a plurality of other files are recorded, the main file having an attribute header for managing forging prohibition information, the reproduction management file being used for managing reproduction of said main file, the apparatus comprising:

calculating means for generating a group integrity check value from information in said management file whenever the main file recorded on the record medium is reproduced;

storing means for storing said group integrity check value generated by said calculating means;

comparing means operable when a record medium is re-attached to said reproducing apparatus for reproducing data,

for comparing a former group integrity check value, associated with the record medium generated by said calculating means at a time when a former reproduction command was performed, with a current group integrity check value generated by said calculating means at the time when a current reproduction command is performed,

and for comparing a value of at least one of plural individual parameters on the re-attached record medium with a corresponding value of that parameter stored in the reproducing apparatus; and

controlling means for permitting the main file to be reproduced, and transferred to the record medium when said comparing means determines that said former group integrity check value is the same as said current group integrity check value, and that said value of the at least one individual parameter coincides with the corresponding value of that parameter stored in the reproducing apparatus;

wherein said group integrity check value is generated from a group of management information of said main file and said plurality of other files;

wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and

wherein said at least one individual parameter is a reproduction start time value stored on the record medium.

14. The reproducing apparatus as set forth in claim 13, wherein the group of management information is at least the number of reproduction times and/or a reproduction limitation value.

15. The reproducing apparatus as set forth in claim 13, wherein the group of management information is file attribute information, reproduction limitation flag, reproduction start date/time, reproduction expiration date/time, number of file reproduction times, number of reproduction permission times, copy control flag, and number of high speed digital copy permission times.

16. The reproducing apparatus as set forth in claim 13, further comprising:

an inner timer, wherein said controlling means prohibits the reproducing operation when the date/time information counted by the inner timer matches the reproduction expiration date/time.

17. The reproducing apparatus as set forth in claim 13,

wherein each main file contains encryption key information, and

wherein said calculating means calculates both the encryption key information contained in a main file corresponding to the current clock value and group of management information using the predetermined function.

18. The reproducing apparatus as set forth in claim 13, wherein the clock information is generated whenever a file is recorded, and wherein said calculating means calculates the key information and the clock information contained in the main file using a predetermined function.

19. The reproducing apparatus as set forth in claim 13, wherein each main file contains encryption key information, wherein whenever a predetermined file is edited, new encryption key information is generated, and wherein said calculating means calculates the new encryption key information and the group of management information using a predetermined function.

20. A reproducing method for reproducing data from a record medium having a program area and a management area, the program area being used for recording a plurality of files, the management area being used for recording management data of a particular file recorded in the program area, the method comprising the steps of:

generating a group integrity check value for said file when said file is reproduced;

storing said group integrity check value, and storing at least one of plural individual parameters on the record medium;

comparing, when said record medium is re-attached to a reproducing apparatus for reproducing data, a former group integrity check value, associated with the record medium and generated at a time when a former reproduction command was performed, with a current group integrity check value generated at the time when a current reproduction command is performed, and comparing at least one of said individual parameters on the re-attached record medium with a corresponding value of that parameter stored in the reproducing apparatus; and

permitting the file corresponding to the current reproduction command to be reproduced when it is determined in said comparing step that said former group integrity check value is the same as said current group integrity check value and that said value of the at least one individual parameters coincides with the corresponding value of that parameter stored in the reproducing apparatus;

wherein said group integrity check value is generated from a group of management information of a plurality of files;

wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and

wherein said at least one individual parameter is a reproduction start time value stored on the record medium.

21. A reproducing method operable by a reproducing apparatus for reproducing a file from a record medium on which a main file, a reproduction management file and a plurality of other files are recorded, the main file having an attribute header for managing forging prohibition information, the reproduction management file being used for reproduction of said main file, the method comprising the steps of:

generating a group integrity check value from information in said management file whenever the main file recorded on the record medium is reproduced;

storing said group integrity check value, and storing at least one of plural individual parameters on the record medium;

comparing, when said record medium is re-attached to a reproducing apparatus for reproducing data, a former group integrity check value generated when a former reproduction command was performed, with a current group integrity check value generated when a current reproduction command is performed, and comparing at least one of said individual parameters on the re-attached record medium with a corresponding value of that parameter stored in the reproducing apparatus; and

permitting the main file to be reproduced when said comparing means determines that said former group integrity check value is the same as said current group integrity check value and that said value of the at least one individual parameters coincides with the corresponding value of that parameter stored in the reproducing apparatus;

wherein said group integrity check value is generated from a group of management information of said main file and said plurality of other files;

wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and

wherein said at least one individual parameter is a reproduction start time value stored on the record medium.

22. A computer readable record medium for controlling a processor, comprising:

a program area for storing a plurality of files; and

a management area for storing management data of a particular file recorded in the program area, such that the processor;

(a) generates a group integrity check value is generated from management information for said file when said file is reproduced, (b) compares a former group integrity check value generated at the time when a former reproduction command was performed is compared with a current group integrity check value generated at the time when a current reproduction command is performed when the record medium is re-attached to a reproducing apparatus for reproducing data, and (c) reproduces the file corresponding to the current reproduction command is reproduced when it is determined that said former group integrity check value is the same as said current group integrity check value and that said value of the at least one individual parameters coincides with the corresponding value of that parameter stored in the reproducing apparatus, said management area further storing at least one of plural individual parameters to be compared for controlling the processor to compare with a corresponding value of that parameter stored in the reproducing apparatus;

wherein said group integrity check value associated with the record medium is generated from a group of management information of a plurality of files; and

wherein said group integrity check value is based on a sequence number recorded in an area of the record medium that can not be read by a non-copyright protection type device; and

wherein said at least one individual parameter is a reproduction start time value stored on the record medium.