	US 7,389,272 B2
	Information recording device and information reproducing device
Toru Kambayashi, Chigasaki (Japan); Koichiro Akiyama, Tokyo (Japan); Yutaka Handa, Yokohama (Japan); and Yoshihiro Ohmori, Yokohama (Japan)
Assigned to Kabushiki Kaisha Toshiba, Kawasaki-shi (Japan)
Filed on Aug. 01, 2003, as Appl. No. 10/631,866.
Application 10/631866 is a division of application No. 09/518130, filed on Mar. 03, 2000, granted, now 6,772,133.
Claims priority of application No. 11-058890 (JP), filed on Mar. 05, 1999.
Prior Publication US 2004/0030656 A1, Feb. 12, 2004
Int. Cl. G06Q 99/00 (2006.01)

U.S. Cl. 705—59 [705/51; 705/57; 705/58; 726/26; 726/30; 380/200; 380/201; 380/202; 380/203]

10 Claims

1. A method of generating license information related to digital contents of information comprising:

receiving a purchase request from a user, the request including an identification of digital contents information, a utilization condition of the digital contents information, and a media identification of a media to which the user records the digital contents information, the digital contents information comprising officially copied contents information which is copied under a right for selling the contents information and privately copied contents information which is copied without a right for selling the contents information, and the utilization condition information of the privately copied contents information being more restricted than the utilization condition information of the officially copied contents information;

determining a content key for the digital contents information based on the identification;

generating a certificator based on the content key and the utilization condition;

generating a license key based on the media identification;

encrypting the content key, the utilization condition, and the certificator based on the license key;

generating a digital signature of encrypted content key, encrypted utilization condition, and encrypted certificator based on a secret key; and

generating a digital license information including a header, the encrypted content key, the encrypted utilization condition, the encrypted certificator, and the digital signature.