Title:
CONTENT USE CONTROL METHOD, CONTENT USE CONTROLLER, STORAGE MEDIUM FOR CONTENT USE CONTROL PROGRAM, AND STORAGE MEDIUM FOR CONTENT
Document Type and Number:
Japanese Patent JP3712925
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent replay attack by a method, where contents stored in a storage medium are backed up; when the number of their uses is limited and a means is provided for making the backup contents unusable, even if they are returned to the original storage medium, after the contents have been used.
SOLUTION: The usable state of the contents reserved in the storage medium 30 are bound, by using information in a security area 32 provided in the storage medium 30. Each time the contents in the storage medium 30 are reproduced, the information in the security area 32 is rewritten to re-bind the usable state of the contents. Only when the information in the security area 32 has the value held when the bind is made, is the bound information enabled. If the information in the security area 32 is different from the value held when the bind is made, the bound information is disabled.
Inventors:
An Shoko
Nobuhisa Miyake
Kana Nakazato
Haruhiko Fujii
Nobuhisa Miyake
Kana Nakazato
Haruhiko Fujii
Application Number:
JP2000249304A
Publication Date:
November 02, 2005
Filing Date:
August 21, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G06F12/14; G06F21/10; G06F21/62; G06Q50/00; G06Q50/10; G11B20/10; H04N5/91; H04N5/93; H04N7/167; H04N21/4623; H04N21/8355; (IPC1-7): G06F12/14; G06F17/60; G11B20/10
Domestic Patent References:
| JP2000188595A | ||||
| JP10283262A | ||||
| JP2000163882A | ||||
| JP2000187935A | ||||
| JP11328033A | ||||
| JP9231578A | ||||
| JP6259452A | ||||
| JP2000099403A | ||||
| JP2000098885A |
Attorney, Agent or Firm:
Yoshiyoshi Ogasawara
Yutaka Morita
Hikaru Okada
Yutaka Morita
Hikaru Okada