CONTENT REPRODUCING DEVICE AND CONTENT REPRODUCING METHOD

• US 20100251382A1
• Filed: 03/15/2010
• Published: 09/30/2010
• Est. Priority Date: 03/24/2009
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: GOTO, Norifumi, Maruyama, Shinya
• Application Number:
  US12/723,933
• Publication Number:
  US 20100251382A1
• Time in Patent Office: Days
• US Class Current: 726/26
• 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 2221/2101 Auditing as a secondary aspect
• CPC Class Codes: G06F 2221/2129 Authenticate client device independently of the user
• CPC Class Codes: G06F 2221/2137 Time limited access, e.g. to a computer or data
• CPC Class Codes: G06F 2221/2151 Time stamp
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources

Abstract

A content reproducing device including a communication section configured to receive license information corresponding to content data, a recording management section configured to record the license information, reproduction history of the content data, and identification information of the license information in a storage medium, a reproduction section, and a license evaluation section configured to allow the reproduction section to reproduce the content data when the reproduction history satisfies a reproduction condition specified in the license information and the identification information of the license information is recorded in the storage medium, and not to allow the reproduction section to reproduce the content data when the identification information of the license information is not recorded in the storage medium.

Claims

1. A content reproducing device comprising:

a communication section configured to receive license information corresponding to content data;

a recording management section configured to record the license information, reproduction history of the content data, and identification information of the license information in a storage medium;

a reproduction section; and

a license evaluation section configured to allow the reproduction section to reproduce the content data when the reproduction history satisfies a reproduction condition specified in the license information and the identification information of the license information is recorded in the storage medium, and not to allow the reproduction section to reproduce the content data when the identification information of the license information is not recorded in the storage medium.

2. The content reproducing device according to claim 1, wherein

when destruction of data corresponding to at least one of the reproduction history of the content data and the identification information of the license information occurs in the storage medium, the recording management section deletes the identification information of the license information recorded in the storage medium.

3. The content reproducing device according to claim 2, wherein

the recording management section records the identification information of the license information, the identification information being associated with information indicating a term of validity, in the recording medium, and deletes an expired term of validity and the identification information of the license information, the identification information being associated with the expired term of validity, from the storage medium.

4. The content reproducing device according to claim 2, wherein

the license information includes a content key used for decoding corresponding content data,

the content key is encrypted in such a manner that the encrypted content key can be decoded by using a user key corresponding to a user as an object to which the license information is provided, and

the recording management section records the one or more user keys, which are provided by the license providing device providing the license information, in the storage medium, and deletes the one or more user keys in addition to the identification information of the license information from the storage medium when destruction of data corresponding to the reproduction history of the content data occurs in the storage medium.

5. The content reproducing device according to claim 4, wherein

when a user key which is not recorded in the storage medium is obtained from the license providing device, the recording management section deletes at least one of the one or more user keys recorded in the storage medium if there is insufficient memory area for the obtained user key in the storage medium.

6. The content reproducing device according to claim 4, wherein

the recording management section records the one or more user keys in the storage medium in such a structure that individual destruction of data corresponding to the one or more user keys can be detected.

7. The content reproducing device according to claim 2, wherein

the recording management section records specific information in the storage medium when the license information is transferred from the communication section to an information processing device, and

the license evaluation section does not allow the reproduction section to reproduce the content data when the specific information is recorded in the storage medium.

8. A content reproducing method comprising the steps of:

receiving license information;

recording the license information and identification information of the license information in a storage medium;

reproducing content data on the basis of the license information;

recording reproduction history of the content data;

allowing the reproduction section to reproduce the content data when the reproduction history satisfies a reproduction condition specified in the license information and the identification information of the license information is recorded in the storage medium; and

not allowing the reproduction section to reproduce the content data when the identification information of the license information is not recorded in the storage medium.

9. The content reproducing method according to claim 8, wherein

when destruction of data corresponding to at least one of the reproduction history of the content data and the identification information of the license information occurs in the storage medium, the recording management section deletes the identification information of the license information recorded in the storage medium.