Information recording apparatus, information reproducing apparatus, and information distribution system

• US 20030004888A1
• Filed: 08/27/2002
• Published: 01/02/2003
• Est. Priority Date: 05/13/1997
• Status: Active Grant

• Current Assignee: Hideki Hirakawa, Kazuo Sumita, Koichiro Akiyama, Shuichi Tsujimoto, Toru Kambayashi, Toshihiro Sugaya
• Original Assignee: Hideki Hirakawa, Kazuo Sumita, Koichiro Akiyama, Shuichi Tsujimoto, Toru Kambayashi, Toshihiro Sugaya
• Inventors: Tsujimoto, Shuichi, Akiyama, Koichiro, Hirakawa, Hideki, Kambayashi, Toru, Sumita, Kazuo, Sugaya, Toshihiro
• Granted Patent: US 7,343,495 B2
• Time in Patent Office: Days
• US Class Current: 705/59
• CPC Class Codes: G06F 21/1088 by using transactions with atomicity, consistency, or isolation and durability [ACID] properties
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G06F 2221/2135 Metering
• CPC Class Codes: G06Q 30/018 Certifying business or products
• 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 20/00224 wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• CPC Class Codes: G11B 20/00253 wherein the key is stored on the record carrier
• CPC Class Codes: G11B 20/00492 wherein content or user data is encrypted
• 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 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 20/00847 wherein the usage restriction is defined by a licence file
• CPC Class Codes: H04L 2209/603 Digital right managament [DRM]
• CPC Class Codes: H04L 9/0891 Revocation or update of secret information, e.g. encryption key update or rekeying

Abstract

An information recording apparatus comprises an encryption section encrypting contents information and also a license condition referred to to limit use of the contents information and a decoding key for decoding the encrypted contents information to generate license information, and a recording section recording the encrypted contents information and the generated license information on a recording medium. An information reproducing apparatus comprises a decoder unit decoding the license information recorded on the recording medium using a second decoding key for decoding the license information and deciding on the basis of the license condition contained in the decoded license information whether the contents information can be used. If it is decided that the contents information can be used, the encrypted contents information recorded on the recording medium is decoded using the first decoding key contained in the decoded license information.

Claims

1. An information recording apparatus comprising:

encryption means for encrypting contents information;

license information generation means for generating encrypted license information containing at least a license condition for limiting use of the contents information and a decoding key for decoding the contents information; and

recording means for recording, on a recording medium, the contents information encrypted by said encryption means and the license information generated by said license information generation means.

2. An information recording apparatus comprising:

separation means for separating a part from contents information;

license information generation means for generating an encrypted license information containing at least the part of information separated by said separation means and a license condition for limiting use of said contents information; and

recording means for recording, on a recording medium, the license information generated by said license information generation means and the remaining part of contents information.

3. An information recording apparatus comprising:

recording information generation means for generating encrypted recording information containing contents information and at least a license condition for limiting use of the contents information; and

recording means for recording the recording information generated by said recording information generation means on a recording medium.

4. An information reproducing apparatus comprising:

means for receiving a recording medium on which encrypted contents information, and license information containing at least a license condition for limiting use of the contents information and first key information for decoding the contents information are recorded;

storage means for storing second key information for decoding the license information;

first decoding means for decoding the license information recorded on said recording medium using the second key information stored in said storage means;

decision means for deciding, on the basis of the license condition contained in the license information decoded by said first decoding means, whether the contents information can be used; and

second decoding means for decoding the contents information recorded on said recording medium using the first key information contained in the license information decoded by said first decoding means when said decision means decides that the contents information can be used.

5. An apparatus according to claim 4, wherein the license condition contains at least an expiration date of the contents information, and said decision means has instrument means for measuring a date, and compares the date measured by said instrument means with the expiration date to decide whether the contents information can be used.

6. An apparatus according to claim 4, wherein the license condition contains at least an expiration date of the contents information, and said decision means has instrument means for measuring a date and update disabling means for disabling update of the date measured by said instrument means, and compares the date measured by said instrument means with the expiration date to decide whether the contents information can be used.

7. An apparatus according to claims 4, wherein the license condition contains at least an expiration date of the contents information, and said decision means has instrument means for measuring a date, reception means for receiving encrypted update information for updating the date measured by said instrument means, and update means for decoding the encrypted update information received by said reception means and updating the date measured by said instrument means on the basis of the decoded update information, and compares the date measured by said instrument means with the expiration date to decide whether the contents information can be used.

8. An apparatus according to claim 4, wherein the license condition contains at least an expiration date of the contents information and a recording date when the information has been recorded on said recording medium, and said decision means has instrument means for measuring a date, and compares the date measured by said instrument means, the expiration date, and the recording date with each other to decide whether the contents information can be used.

9. An apparatus according to claim 4, wherein said license condition contains at least a contents information identifier for identifying the contents information, and said apparatus further comprises request means for requesting fee payment for use of contents information corresponding to the contents information identifier when said decision means decides that the contents information can be used, and update means for updating at least the license condition recorded on said recording medium when fee payment for the request is confirmed.

10. An apparatus according to claim 4, wherein the license condition contains at least an expiration date of the contents information, said apparatus further comprises license condition update means for adding a decoder unit identifier of a unit capable of decoding the license information to the license condition when the license condition contains no decoder unit identifier for identifying the unit capable of decoding the license information, and said decision means decides, on the basis of the expiration date and the decoder unit identifier, whether the contents information can be used.

11. An information reproducing apparatus comprising:

means for receiving a recording medium on which part of contents information and encrypted license information containing at least a license condition for limiting use of the contents information and the remaining part of the contents information are recorded;

storage means for storing key information for decoding the license information;

decoding means for decoding the license information recorded on said recording medium using the key information stored in said storage means;

decision means for deciding, on the basis of the license condition contained in the license information decoded by said decoding means, whether the contents information can be used; and

reproduction means for synthesizing the part of contents information contained in the license information decoded by said decoding means with the part of contents information recorded on said recording medium and reproducing the contents information when said decision means decides that the contents information can be used.

16. An apparatus according to claim 15, further comprising second storage means for storing third key information for decoding first encryption information containing at least the first key information and the license condition, the first encryption information being encrypted and contained in the license information, and second decoding means for decoding the first encryption information contained in the license information decoded by said decoding means, using the third key information stored in said second storage means.

17. An apparatus according to claim 15, wherein communication with said distribution device is performed through a recording medium having an arithmetic function.

18. An apparatus according to claim 15, wherein communication with said distribution device is performed through a recording medium having an arithmetic function, said apparatus further comprises third storage means for storing a second secret parameter shared with said recording medium, reception means for receiving encrypted identification information of said recording medium from said recording medium, fourth key generation means for generating fourth key information on the basis of the second secret parameter stored in said third storage means and a second public parameter exchanged with said recording medium, and third decoding means for decoding the encrypted identification information received by said reception means using the fourth key information generated by said fourth key generation means, and said decision means decides, on the basis of the identification information decoded by said third decoding means and the decoded license information, whether the contents information can be used.

12. An information reproducing apparatus comprising:

means for receiving a recording medium on which encrypted recording information containing at least contents information and a license condition for limiting use of the contents information is recorded;

storage means for storing key information for decoding the recording information;

decoding means for decoding the recording information recorded on said recording medium using the key information stored in said storage means;

decision means for deciding, on the basis of the license condition contained in the recording information decoded by said decoding means, whether the contents information can be used; and

reproduction means for reproducing the contents information decoded by said decoding means when said decision means decides that the contents information can be used.

13. An information reproducing apparatus comprising:

means for receiving a recording medium on which encrypted contents information and license information containing at least a license condition for limiting use of the contents information and first key information for decoding the contents information are recorded;

instrument means for measuring a date;

decision means for deciding, on the basis of the date measured by said instrument means and the license information recorded on said recording medium, whether the contents information can be used; and

information reproduction means for, when said decision means decides that the contents information can be used, decoding and reproducing the contents information recorded on said recording medium using the first key information output from said decision means,

wherein information for notifying said decision means of the date from said instrument means and the first key information output from said decision means to said information reproduction means are encrypted.

14. An information usage apparatus comprising:

means for receiving first key generation information necessary for generating encrypted first key information for decoding encrypted contents information; and

means for holding second key generation information necessary for generating second key information for decoding the first key information, generating the second key information on the basis of the second key generation information and the input first key generation information, and decoding the encrypted contents information using the generated second key information.

15. An information usage apparatus comprising:

means for receiving encrypted license information containing at least a license condition for limiting use of contents information and first key information for decoding the contents information;

first storage means for storing a first secret parameter shared with a license information distribution device;

first key generation means for generating second key information on the basis of the first secret parameter stored in said first storage means and a first public parameter exchanged with said distribution device;

first decoding means for decoding the received encrypted license information using the second key information generated by said first key generation means;

decision means for deciding, on the basis of the license condition contained in the license information decoded by said first decoding means, whether the contents information can be used; and

second decoding means for decoding the contents information using the first key information contained in the license information decoded by said first decoding means when said decision means decides that the contents information can be used.

19. A recording medium having an arithmetic function, on which encrypted license information containing at least a license condition for limiting use of contents information and first key information for decoding the contents information is recorded, comprising:

first storage means for storing a first secret parameter shared with a license information recording device and a second secret parameter shared with a decision device for deciding on the basis of the license information whether the contents information can be used;

second storage means for storing identification information given in advance;

first key generation means for generating second key information on the basis of the first secret parameter stored in said first storage means and a first public parameter exchanged with said recording device;

first encryption means for encrypting the identification information using the second key information generated by said first key generation means;

second key generation means for generating third key information on the basis of the second secret parameter stored in said first storage means and a second public parameter exchanged with said decision device;

second encryption means for encrypting the identification information using the third key information generated by said second key generation means; and

transmission means for transmitting the identification information encrypted by said first and second encryption means to said recording device and said decision device.

20. A recording medium having an arithmetic function, on which encrypted license information containing at least a license condition for limiting use of contents information and first key information for decoding the contents information is recorded, comprising:

first storage means for storing a first secret parameter shared with a license information recording device and a second secret parameter shared with an information usage device which uses the contents information on the basis of the license information;

second storage means for storing identification information given in advance;

first key generation means for generating second key information on the basis of the first secret parameter stored in said first storage means and a first public parameter exchanged with said recording device;

first encryption means for encrypting the identification information using the second key information generated by said first key generation means;

second key generation means for generating third key information on the basis of the second secret parameter stored in said first storage means and a second public parameter exchanged with said information usage device;

second encryption means for encrypting the identification information using the third key information generated by said second key generation means; and

transmission means for transmitting the identification information encrypted by said first and second encryption means to said recording device and said information usage device.