Information processing apparatus and method, information recording medium, and computer program

• US 20050289139A1
• Filed: 06/14/2005
• Published: 12/29/2005
• Est. Priority Date: 06/24/2004
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takashima, Yoshikazu, Asano, Tomoyuki, Ueda, Kenjiro, Muramatsu, Katsumi, Kitani, Satoshi
• Granted Patent: US 8,010,806 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00362 the key being obtained from a media key block [MKB]
• CPC Class Codes: G11B 20/00528 wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file
• CPC Class Codes: G11B 20/00536 wherein encrypted content data is subjected to a further, iterated encryption, e.g. interwoven encryption
• 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 20/0071 involving a purchase action
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 2020/1288 Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
• CPC Class Codes: G11B 2220/2541 Blu-ray discs; Blue laser DVR discs
• CPC Class Codes: Y10S 705/901 Digital rights management
• CPC Class Codes: Y10S 705/912 having origin or program id

Abstract

An information processing apparatus includes a content usage control information analyzer configured to read content usage control information recorded on an information recording medium and to perform content usage processing according to the content usage control information. The content usage control information analyzer determines whether the usage of content corresponding to the content usage control information is allowed based on a value of a flag included in the content usage control information and device information whether the information processing apparatus is an extended device having an extended function or a basic device without an extended function.

Claims

1. An information processing apparatus comprising:

a content usage control information analyzer configured to read content usage control information recorded on an information recording medium and to perform content usage processing according to the content usage control information,

wherein the content usage control information analyzer determines whether the usage of content corresponding to the content usage control information is allowed based on a value of a flag included in the content usage control information and device information whether the information processing apparatus is an extended device having an extended function or a basic device without an extended function.

2. The information processing apparatus according to claim 1, wherein the content usage control information includes basic control information and extended control information, and the content usage control information analyzer determines based on the value of the flag included in the basic control information whether the usage of content corresponding to the content usage control information is allowed.

3. The information processing apparatus according to claim 1, wherein, if the information processing apparatus is an extended device having an extended function, the information processing apparatus obtains, via a network, information necessary for using the content corresponding to the content usage control information based on the value of the flag included in the content usage control information.

4. The information processing apparatus according to claim 1, further comprising:

encryption processing means configured to decrypt encrypted content recorded on the information recording medium,

wherein the encryption processing means generates a unit key corresponding to each content management unit stored in the information recording medium and decrypts the content stored in the information recording medium by performing data processing using the unit key, and

in generating the unit key, the encryption processing means performs data processing by using data of the content usage control information set for the content management unit.

5. An information processing apparatus comprising:

a content usage control information analyzer configured to read content usage control information recorded on an information recording medium and to perform content usage processing according to the content usage control information,

wherein the content usage control information analyzer obtains identification information of a content management unit to be controlled from the content usage control information and specifies the content management unit based on the obtained identification information.

6. The information processing apparatus according to claim 5, further comprising:

encryption processing means configured to decrypt encrypted content recorded on the information recording medium,

wherein the encryption processing means generates a unit key corresponding to each content management unit stored in the information recording medium and decrypts the content stored in the information recording medium by performing data processing using the unit key, and

in generating the unit key, the encryption processing means performs data processing by using data of the content usage control information set for the content management unit.

7. An information recording medium on which content whose usage is to be managed is recorded,

wherein data included in the content is set as content management units,

data included in each content management unit is stored as data encrypted based on a unit key associated with the content management unit, and

content usage control information corresponding to each content management unit is stored, the content usage control information including a flag indicating whether the usage of the content is allowed depending on whether a device to use the content is an extended device having an extended function or a basic device without an extended function.

8. The information recording medium according to claim 7, wherein the content usage control information includes information having tamper-proof data for the content usage control information.

9. The information recording medium according to claim 7, wherein the content usage control information includes a data portion having the flag set as a non-encrypted portion and an encrypted data portion.

10. An information recording medium on which content whose usage is to be managed is recorded,

wherein data included in the content is set as content management units,

data included in each content management unit is stored as data encrypted based on a unit key associated with the content management unit, and

content usage control information corresponding to each content management unit is stored, the content usage control information including identification information of a content management unit whose usage is controlled.

11. The information recording medium according to claim 10, wherein the content usage control information includes information having tamper-proof data for the content usage control information.

12. The information recording medium according to claim 10, wherein the content usage control information includes a data portion having the flag set as a non-encrypted portion and an encrypted data portion.

13. An information recording medium on which content whose usage is to be managed is recorded,

wherein data included in the content is set as content management units,

data included in each content management unit is stored as data encrypted based on a unit key associated with the content management unit, and

content usage control information corresponding to each content management unit is stored, the content usage control information including data encrypted with an encryption key which is generated by using data included in a header of the content usage control information as a seed.

14. The information recording medium according to claim 13, wherein the data used as a seed includes identification information of the content management unit.

15. The information recording medium according to claim 13, wherein the data used as a seed includes random-number data.

16. An information processing method comprising the steps of:

reading content usage control information recorded on an information recording medium;

identifying a value of a flag included in the content usage control information; and

determining whether the usage of content corresponding to the content usage control information is allowed based on the value of the flag and device information whether an information processing apparatus to use the content is an extended device having an extended function or a basic device without an extended function.

17. The information processing method according to claim 16, wherein the content usage control information includes basic control information and extended control information, and, in the determining step, it is determined based on the value of the flag included in the basic control information whether the usage of content corresponding to the content usage control information is allowed.

18. The information processing method according to claim 16, further comprising the step of:

obtaining, if the information processing apparatus is an extended device having an extended function, via a network, information necessary for using the content corresponding to the content usage control information based on the value of the flag included in the content usage control information.

19. The information processing method according to claim 16, further comprising the steps of:

generating a unit key corresponding to each content management unit stored in the information recording medium; and

decrypting content stored in the information recording medium by performing data processing using the unit key,

wherein, in the generating step, data processing by using data of the content usage control information set for the content management unit is performed.

20. An information processing method comprising the steps of:

reading content usage control information recorded on an information recording medium; and

analyzing the content usage control information,

wherein, in the analyzing step, identification information of a content management unit to be controlled is obtained from the content usage control information, and the content management unit is specified based on the identification information of the content management unit.

21. The information processing method according to claim 20, further comprising the steps of:

generating a unit key corresponding to each content management unit stored in the information recording medium; and

decrypting content stored in the information recording medium by performing data processing using the unit key,

wherein, in the generating step, data processing by using data of the content usage control information set for the content management unit is performed.

22. A computer program allowing a computer to analyze content usage control information, comprising the steps of:

identifying a value of a flag included in the content usage control information read from an information recording medium; and

determining whether the usage of content corresponding to the content usage control information is allowed based on the value of the flag and device information whether an information processing apparatus to use the content is an extended device having an extended function or a basic device without an extended function.

23. A computer program allowing a computer to analyze content usage control information, comprising the steps of:

obtaining identification information of a content management unit to be controlled from the content usage control information; and

specifying the content management unit based on the identification information of the content management unit.