Patent ID: 8239681

Claim:
An information processing device regarding which access as to data held by the information processing device itself, in a plurality of regions wherein information managing methods mutually differ, is requested from another information processing device, said information processing device comprising: authenticating means to perform authenticating processing of said other information processing device by an information managing method of said plurality of regions, with regard to an access destination as to a predetermined region within said plurality of regions, out of access destinations of said other information processing device; receiving means to receive an access license ticket including an access code indicating data for said other information processing device to access and a check digit, from said other information processing device that is authenticated by said authenticating means as a valid partner; access license ticket generating key generating means to generate an access license ticket generating key, which is key information for computing a check digit, using predetermined data held beforehand in said predetermined region, a root key that is key information corresponding to a root directory of said predetermined region, wherein the root key is used to encrypt data within said predetermined region, an access control key that is key information to control an access method to data within said predetermined region, corresponding to an access code described in said access license ticket received by said receiving means, other key information, used for authentication processing with the information managing method of said predetermined region, which is key information to manage data of a region other than said predetermined region, corresponding to an access code described in said access license ticket received by said receiving means, an area key that is key information corresponding to said predetermined region, wherein the area key is used to encrypt data within said predetermined region, and a service key to control the access method of data within the access destination, wherein the service key is used to authenticate data access to the predetermined region; and check digit computing means to compute a check digit corresponding to the access code described in said access license ticket received by said receiving means, using said access license ticket generating key generated with said access license ticket generating key generating means; and access license ticket validating means to validate said access license ticket received by said receiving means, using said check digit computed by said check digit computing means.