Contents processing system

• US 20050005148A1
• Filed: 07/23/2004
• Published: 01/06/2005
• Est. Priority Date: 07/30/1998
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Tomoyuki, Oishi, Tateo, Osawa, Yoshitomo, Ishibashi, Yoshihito
• Granted Patent: US 7,310,731 B2
• Time in Patent Office: Days
• US Class Current: 713/193
• CPC Class Codes: G06F 21/107 License processing; Key processing
• CPC Class Codes: G06F 21/16 Program or content traceability, e.g. by watermarking
• CPC Class Codes: G06F 21/72 in cryptographic circuits
• CPC Class Codes: G06F 2211/008 Public Key, Asymmetric Key, Asymmetric Encryption
• CPC Class Codes: G06F 2221/2135 Metering
• CPC Class Codes: G06Q 30/06 Buying, selling or leasing transactions
• CPC Class Codes: G11B 20/00724 wherein a prepaid credit balance is registered on the recording medium
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 9/0822 using key encryption key
• CPC Class Codes: H04L 9/083 involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]

Abstract

A first information processing unit 100 stores identification information into a storage module 152, stores an encrypted contents signal into a mass storage unit 180, and supplies the encrypted contents signal and identification information to a second information processing unit 200 through a communication section 110. In a receiving unit 170 of the first information processing unit 100, log information generated by a purchase processing module 153 is stored into the storage module 152 every time the contents key is decoded, and the log information is transmitted at predetermined timing to a key management center 30 through the transmission section 110. The second information processing unit 200 receives the encrypted contents signal and the identification information through a communication section 210, and causes a contents processing section 260 to decode the encrypted contents signal and to append the identification information thereto.

Claims

1. A contents signal receiving device comprising:

receiving means for receiving an encrypted contents signal;

storage means for storing the encrypted contents signal received by the receiving means;

decoding means for decoding the encrypted contents signal stored in the storage means when an instruction to decode the encrypted contents signal stored in the storage means is given as user-designated information; and

identification information appending means for appending identification information to the contents signal decoded by the decoding means.

2. The contents signal receiving device as claimed in claim 1, wherein the identification information is the identification information proper to the contents signal receiving device.

3. The contents signal receiving device as claimed in claim 1, wherein the identification information is embedded to the contents signal as a watermark.

4-16. -16. (Canceled)

18-25. -25. (Canceled)

26. A contents signal receiving method comprising the steps of:

receiving an encrypted contents signal;

storing the received encrypted contents signal;

decoding the stored encrypted contents signal when an instruction to decode the stored encrypted contents signal is given as user-designated information; and

appending identification information to the decoded contents signal.

27. The contents signal receiving method as claimed in claim 26, wherein the identification information is the identification information proper to a contents signal receiving device.

28. The contents signal receiving method as claimed in claim 26, wherein the identification information is embedded to the contents signal as a watermark.

29-45. -45. (Canceled)