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

• US 7,343,495 B2
• Filed: 08/27/2002
• Issued: 03/11/2008
• Est. Priority Date: 05/13/1997
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Akiyama, Koichiro, Hirakawa, Hideki, Kambayashi, Toru, Sumita, Kazuo, Sugaya, Toshihiro, Tsujimoto, Shuichi
• Primary Examiner(s): Revak; Christopher
• Assistant Examiner(s): AVERY, JEREMIAH L
• Application Number:
  US10/227,828
• Publication Number:
  US 20030004888A1
• Time in Patent Office: 2,023 Days
• Field of Search: None
• US Class Current: 713/193
• 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. A method of moving license information comprising:

reading, from a first removable computer readable recording medium recording contents and capable of being inserted into a computer, (a) the license information to enable use of the contents recorded in the first removable computer readable recording medium and (b) a first unique medium ID of the first removable computer readable recording medium;

receiving a second removable computer readable recording medium;

reading a second unique medium ID of the second removable computer readable recording medium;

processing the license information in accordance with the first unique medium ID of the first removable computer readable recording medium to obtain first processed license information;

processing the first processed license information in accordance with the second unique medium ID of the second removable computer readable recording medium to obtain second processed license information;

writing the second processed license information to the second removable computer readable recording medium; and

deleting the license information stored in the first removable computer readable recording medium.

2. A method according to claim 1, wherein processing the license information comprises decrypting the license information with the first unique medium ID of the first removable computer readable recording medium.

3. A method according to claim 1, wherein processing the first processed license information comprises encrypting the first processed license information with the second unique medium ID of the second removable computer readable recording medium.

4. A method according to claim 1, wherein processing the license information comprises decrypting the license information with the first unique medium ID of the first removable computer readable recording medium, and processing the first processed license information comprises encrypting the first processed license information with the second unique medium ID of the second removable computer readable recording medium.

9. A method according to claim 1, wherein the second removable computer readable recording medium comprises a card type recording medium.

5. An apparatus for moving license information comprising:

a first reading unit configured to read from a first removable computer readable recording medium recording contents and capable of being inserted into a computer, (a) the license information to enable use of contents recorded in the first removable computer readable recording medium and (b) a first unique medium ID of the first removable computer readable recording medium;

a medium receiving unit configured to receive a second removable computer readable recording medium;

a second reading unit configured to read a second unique medium ID of the second removable computer readable recording medium;

a first processing unit configured to process the license information in accordance with the first unique medium ID of the first removable computer readable recording medium to obtain first processed license information;

a second processing unit configured to process the first processed license information in accordance with the second unique ID of the second removable computer readable recording medium to obtain second processed license information;

a writing unit configured to write the second processed license information to the second removable computer readable recording medium; and

a deleting unit configured to delete the license information stored in the first removable computer readable recording medium.

6. An apparatus according to claim 5, wherein the first processing unit comprises a decrypting unit configured to decrypt the license information with the first unique medium ID of the first removable computer readable recording medium.

7. An apparatus according to claim 5, wherein the second processing unit comprises an encrypting unit configured to encrypt the first processed license information with the second unique medium ID of the second removable computer readable recording medium.

8. An apparatus according to claim 5, wherein the first processing unit comprises a decrypting unit configured to decrypt the license information with the first unique medium ID of the first removable computer readable recording medium, and the second processing unit comprises an encrypting unit configured to encrypt the first processing license information with the second unique medium ID of the second removable computer readable recording medium.

10. An apparatus according to claim 5, wherein the second removable computer readable recording medium comprises a card type recording medium.