LICENSE GENERATION DEVICE

Japanese Patent JP2013047890

A

To make the term of validity of a decryption key set in the second and following licenses to be the same as the initial term of validity.

A license generation part 15 of a license generation device 1 is configured to, when generating a license for the first time, set a timing in which a period with length shown by a decryption key validity term length information set in license content information in license content information 14 has passed from the current timing as the term of validity of a decryption key in the license, and to make an issue information storage part 13 store issue information including license initial generation date information showing the current timing, and to, when generating the license in the second and following times, search the issue information from the issue information storage part 13, and to set the timing in which the period with length shown by the decryption key validity term length information set in the license content information in the license content information 14 has passed from the timing shown by the license initial generation date information in the issue information as the term of validity in the license.

WO/2002/099716	METHOD FOR CONTROLLING ACCESS TO DIGITAL CONTENT AND STREAMING MEDIA
JP5835745	Information distribution system and information distribution method
JP3984792	Data processing method, data processing equipment

CHAKI YUKIKO
KANEKIYO TOMOYUKI
HORII MOTOYUKI

JP2011186046A

March 07, 2013

August 29, 2011

Click for automatic bibliography generation  

NIPPON TELEGRAPH & TELEPHONE

G06F21/10

JP2002351836A	2002-12-06
JP2006004194A	2006-01-05
JP2009223383A	2009-10-01
JP2001236232A	2001-08-31
JP2009199195A	2009-09-03
JP2002351836A	2002-12-06
JP2006004194A	2006-01-05
JP2009223383A	2009-10-01
JP2001236232A	2001-08-31
JP2009199195A	2009-09-03

Hidekazu Miyoshi
Rie Kudo

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