Diligent control of preview of stored contents

Details Diligent control of preview of stored contents Diligent control of preview of stored contents

2008-05-27

2008-05-27

Chai, Longbit (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S161000, C713S162000, C713S163000, C713S164000, C713S165000, C713S189000, C713S190000, C713S191000, C713S192000, C713S194000, C380S228000, C380S229000, C380S230000, C380S231000, C380S232000, C726S002000, C726S003000, C726S004000, C726S005000, C726S006000

Reexamination Certificate

active

07380135

ABSTRACT:
A method of transmitting contents, which are to be received at a reception side where a portion of the contents is previewed while the contents are not accessible for playing other than for a preview purpose, includes the steps of encrypting the contents by a first encryption key, generating information indicative of an elapsed time of the contents that indicates a relationship between positions on a time axis of the contents representing an amount of time that passes as the contents are played and a time count that accrues as a preview time when the contents are previewed, encrypting the first encryption key and the information indicative of an elapsed time of the contents by a second encryption key, thereby generating first encrypted information, encrypting the second encryption key and content-usage control information by a third encryption key, thereby generating second encrypted information, the content-usage control information indicating usage of the contents on the reception side, and transmitting the encrypted contents, the first encrypted information, and the second encrypted information to the reception side.

REFERENCES:
patent: 5594794 (1997-01-01), Eyer et al.
patent: 5774548 (1998-06-01), Bando et al.
patent: 6252964 (2001-06-01), Wasilewski et al.
patent: 08-237632 (1996-09-01), None
patent: 11-308595 (1999-11-01), None
patent: 2001-128142 (2001-05-01), None
patent: 2002-027417 (2002-01-01), None
Patent Abstracts of Japan of JP 11-308595 Dated Nov. 5, 1999.
Patent Abstracts of Japan of JP 08-237632 Dated Sep. 13, 1996.
Patent Abstracts of Japan of JP 2001-128142 Dated May 11, 2001.
Patent Abstracts of Japan of JP 2002-027417 Dated Jan. 25, 2002.

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