APPARATUS, METHOD, AND COMPUTER PROGRAM PRODUCT FOR RECORDING CONTENT

• US 20100054698A1
• Filed: 03/16/2007
• Published: 03/04/2010
• Est. Priority Date: 07/11/2006
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Solutions Corporation (Toshiba Corporation)
• Inventors: Ishihara, Atsushi, Kato, Taku, Isozaki, Hiroshi, Kambayashi, Toru, Matsukawa, Shinichi
• Granted Patent: US 8,145,030 B2
• Time in Patent Office: Days
• US Class Current: 386/252
• CPC Class Codes: G06F 21/1011 to devices
• CPC Class Codes: G06F 21/1014 to tokens
• 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 20/00847 wherein the usage restriction is defined by a licence file
• CPC Class Codes: G11B 20/00855 involving a step of exchanging information with a remote server
• CPC Class Codes: G11B 20/00884 involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
• CPC Class Codes: G11B 2220/218 Write-once discs
• CPC Class Codes: G11B 2220/2579 HD-DVDs [high definition DVDs]; AODs [advanced optical discs]

Abstract

An apparatus determines whether a combination of a certificate type of a content certificate recorded on a source recording medium and a medium type of the source recording medium is a proper combination. If the combination is a proper combination, the apparatus requests a license server, which is connected to the apparatus via a network, to give approval to record content on a target recording medium. If the apparatus is a legitimate DVD recorder, the license server sends to the content recording apparatus a content certificate including on the source recording medium as the certificate type. The apparatus records the content together with the received content certificate on the target recording medium.

Claims

1. An apparatus to record a content onto a target recording medium, the content being encrypted by a first cryptographic key and being recorded on a source recording medium embedded with a predetermined digital water mark, the source recording medium recording a content certificate thereon, the content certificate including

a certificate type indicating a record type of the content on the source recording medium, the apparatus comprising:

a certificate verifying unit that verifies whether a combination of the certificate type of the content certificate recorded on the source recording medium and a medium type of the source recording medium is a proper combination;

a key storage unit that stores therein a public key corresponding to the second cryptographic key;

a requesting unit that transmits, if the certificate verifying unit verifies that the combination is a proper combination, a record-permission request to a license server to get approval to record the content on the target recording medium via an on-line network;

a certificate receiving unit that receives, if the license server gives approval to record the content on the target recording medium, a content certificate that includes a certificate type indicating a record type on the target recording medium from the license server; and

a recording unit that records the content together with the content certificate received from the license server on the target recording medium,

wherein existence of the predetermined digital water mark is determined at the time of playback of the content when the content certificate does not exist in the target recording medium.

2. The apparatus according to claim 1, wherein

the source recording medium is a read-only recording medium,

the target recording medium is a recordable recording medium,

the certificate verifying unit verifies whether a combination of a certificate type of the content certificate recorded on the source recording medium and a medium type of the source recording medium is a proper combination,

the requesting unit transmits, if the certificate verifying unit verifies that the combination is a proper combination, the record-permission request to the license server to get approval to copy the content recorded on the source recording medium onto the target recording medium,

the certificate receiving unit receives, if the license server gives approval to copy the content onto the target recording medium, the content certificate that includes a certificate type indicating a medium type of the target recording medium from the license server, and

the recording unit copies the content recorded on the source recording medium onto the target recording medium, and records the content certificate received from the license server on the target recording medium.

3. The apparatus according to claim 1, wherein

the source recording medium is a read-only recording medium,

the target recording medium is a recordable recording medium, the content recording apparatus further comprising a storage unit that stores therein the content,

the certificate verifying unit verifies whether a combination of a certificate type of the content certificate recorded on the source recording medium and a medium type of the source recording medium is a proper combination,

the requesting unit transmits a move-permission request to the license server to get approval to move the content to the target recording medium,

the certificate receiving unit receives, if the license server gives approval to move the content to the target recording medium, the content certificate that includes a certificate type indicating a medium type of the target recording medium from the license server, and

the recording unit decrypts, if the license server gives approval to move the content to the target recording medium, the content recorded on the source recording medium by using the first cryptographic key, and copies decrypted content onto the storage unit, and moves the decrypted content from the storage unit to the target recording medium, and records the content certificate received from the license server on the target recording medium.

4. The apparatus according to claim 3, wherein

a content type is recorded as a certificate type of the content certificate depending on the combination of the certificate type and the medium type of the source recording medium, the content type being any one of content recorded on a read-only recording medium, copied content recorded on a recordable recording medium, and download content recorded on a recordable recording medium,

the requesting unit transmits, if the certificate verifying unit verifies that the combination is a proper combination, a copy-permission request to the license server to get approval to copy the content onto the storage unit or to move the content to the target recording medium,

the certificate receiving unit receives, if the license server gives approval to copy the content onto the storage unit or to move the content to the target recording medium, a content certificate that includes a content type on the target recording medium as a certificate type from the license server, and

the recording unit copies the content from the source recording medium onto the storage unit, or moves the content from the storage unit to the target recording medium, and records the content certificate received from the license server on the target recording medium.

5. The apparatus according to claim 1, wherein

the target recording medium is a recordable recording medium,

the requesting unit transmits medium identifying information unique to the target recording medium together with the request to the license server, and

the certificate receiving unit receives a content certificate that is bound to the medium identifying information from the license server.

6. The apparatus according to claim 1, wherein

the target recording medium is a recordable recording medium,

the requesting unit transmits medium identifying information unique to the target recording medium together with the request to the license server, and

the certificate receiving unit receives a content certificate and the first cryptographic key that is bound to the medium identifying information from the license server.

7. An apparatus to records a content onto a recordable target recording medium, the content being encrypted by a first cryptographic key and being recorded on a read-only source recording medium embedded with a digital water mark, the read-only source recording medium recording a content certificate thereon, the content certificate including

a certificate type indicating a record type of the content on the source recording medium, the apparatus comprising:

a requesting unit that transmits a medium type of the source recording medium and the content certificate including the certificate type on the source recording medium to a license server via an on-line network as a record-permission request to give approval to record the content on the target recording medium;

a certificate receiving unit that receives, if the license server gives approval to record the content on the target recording medium, and also if the license server verifies that a combination of the certificate type and a medium type of the source recording medium is a proper combination, a content certificate that includes a certificate type indicating a record type on the target recording medium from the license server; and

a recording unit that records the content together with the content certificate received from the license server on the target recording medium,

wherein existence of the predetermined digital water mark is determined at the time of playback of the content when the content certificate does not exist in the target recording medium.

8. The apparatus according to claim 7, wherein

the requesting unit transmits a medium type of the source recording medium and the content certificate including the certificate type recorded on the source recording medium to the license server as a record-permission request to give approval to copy the content onto the target recording medium,

the certificate receiving unit receives, if the license server gives approval to copy the content onto the target recording medium, and also if the license server verifies that a combination of the certificate type and the medium type of the source recording medium is a proper combination, a content certificate that includes a certificate type indicating a medium type of the target recording medium from the license server, and

the recording unit copies the content recorded on the source recording medium onto the target recording medium, and records the content certificate received from the license server on the target recording medium.

9. The apparatus according to claim 7, further comprising a storage unit that stores therein the content, wherein

the requesting unit transmits a medium type of the source recording medium and the content certificate including the certificate type recorded on the source recording medium to the license server to request to move the content to the target recording medium,

the certificate receiving unit receives a content certificate that includes a certificate type indicating a medium type of the target recording medium from the license server, and

the recording unit decrypts, if the license server gives approval to move the content to the target recording medium, and also if the license server verifies that a combination of the certificate type and the medium type of the source recording medium is a proper combination, the content recorded on the source recording medium by using the first cryptographic key, copies decrypted content onto the storage unit, moves the decrypted content stored in the storage unit to the target recording medium, records the content certificate received from the license server on the target recording medium.

10. The apparatus according to claim 9, wherein

the content certificate recorded on the source recording medium further includes content identifying information that is unique to the content;

the recording unit copies, if a format of the content is not converted, the content certificate recorded on the source recording medium onto the storage unit; and

the requesting unit transmits any one of the content certificate copied onto the storage unit and the content identifying information included in the content certificate to the license server.

11. The apparatus according to claim 9, wherein

a content type is recorded as a certificate type included in the content certificate depending on the combination of the certificate type and the medium type of the source recording medium, the content type being any one of content recorded on a read-only recording medium, copied content recorded on a recordable recording medium, and download content recorded on a recordable recording medium,

the requesting unit transmits the medium type of the source recording medium and the content certificate including the certificate type recorded on the source recording medium to the license server as a copy-permission request to give approval to copy the content recorded on the source recording medium onto the storage unit or to move the content copied onto the storage unit to the target recording medium,

the certificate receiving unit receives, if the license server gives approval to copy the content from the source recording medium onto the storage unit or to move the content from the storage unit to the target recording medium, and also if the license server verifies that the combination of the certificate type and the medium type of the source recording medium is a proper combination, a content certificate that includes a content type on the target recording medium as a certificate type from the license server, and

the recording unit copies the content from the source recording medium onto the storage unit, or moves the content from the storage unit to the target recording medium, and records the content certificate received from the license server on the target recording medium.

12. The apparatus according to claim 9, wherein

the content certificate recorded on the source recording medium further includes content identifying information that is unique to the content,

the recording unit copies, if the content have not been subjected to format conversion, the content certificate from the source recording medium onto the storage unit;

and

the requesting unit transmits any one of the content certificate copied onto the storage unit and the content identifying information included in the content certificate to the license server.

13. The apparatus according to claim 9, wherein the requesting unit transmits information about the hash value to the license server and requests the license server to return a content certificate that is to be recorded on the target recording medium.

14. The apparatus according to claim 13, wherein the requesting unit transmits the content certificate recorded on the source recording medium as the information about the hash value to the license server.

15. The apparatus according to claim 13, wherein the requesting unit transmits the content identifying information that is included in the content certificate recorded on the source recording medium as the information about the hash value to the license server.

16. The apparatus according to claim 13, wherein the requesting unit transmits a portion of the content as the information about the hash value to the license server.

17. The apparatus according to claim 16, wherein the requesting unit transmits a hash value that is calculated from the portion of the content as the information about the hash value to the license server.

18. A method to record a content onto a target recording medium, the content being encrypted by a first cryptographic key and being recorded on a source recording medium being embedded with a predetermined digital watermark, the source recording medium recording a content certificate thereon, the content certificate including

a certificate type indicating a record type of the content on the source recording medium, the method comprising:

verifying whether a combination of the certificate type of the content certificate recorded on the source recording medium and a medium type of the source recording medium is a proper combination;

storing a public key corresponding to the second cryptographic key in a key storage unit;

transmitting, if it is verified at the verifying that the combination is a proper combination, a record-permission request to a license server to get approval to record the content on the target recording medium via an on-line network;

receiving, if the license server gives approval to record the content on the target recording medium, a content certificate that includes a certificate type indicating a record type on the target recording medium from the license server; and

recording the content together with the content certificate received from the license server on the target recording medium,

wherein existence of the predetermined digital water mark is determined at the time of playback of the content when the content certificate does not exist in the target recording medium.

19. A computer program product that includes a computer-readable recording medium that stores therein a plurality of commands that cause a computer to record a content onto a target recording medium, the content being encrypted by a first cryptographic key and being recorded on a source recording medium embedded with a predetermined digital watermark, the source recording medium recording a content certificate thereon, the content certificate including

a certificate type indicating a record type of the content on the source recording medium,

wherein the commands cause the computer to execute:

verifying whether a combination of the certificate type of the content certificate recorded on the source recording medium and a medium type of the source recording medium is a proper combination;

storing a public key corresponding to the second cryptographic key in a key storage unit;

transmitting, if it is verified at the verifying that the combination is a proper combination, a record-permission request to a license server to get approval to record the content on the target recording medium via an on-line network;

receiving, if the license server gives approval to record the content on the target recording medium, a content certificate that includes a certificate type indicating a record type on the target recording medium from the license server; and

recording the content together with the content certificate received from the license server on the target recording medium,

wherein existence of the predetermined digital water mark is determined at the time of playback of the content when the content certificate does not exist in the target recording medium.