The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2006
Filed:
Apr. 25, 2000
Takatoshi Ono, Aichi-ken, JP;
Shunji Harada, Osaka, JP;
Takatoshi Ono, Aichi-ken, JP;
Shunji Harada, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A data usage controlling apparatus that reads a type 1 key from a storage unit and (a) main data, (b) a type 2 key that has been encrypted using the type 1 key, and (c) condition information that has been encrypted using the type 2 key from a recording medium, decrypts the condition information using the type 2 key, and controls usage of the read main data in accordance with the decrypted condition information. In accordance with usage of the main data, the decrypted condition information is updated, a new type 2 key is generated, and the stored type 1 key is updated. The updated condition information is encrypted using the new type 2 key and used to replace the encrypted condition information on the recording medium. The new type 2 key is encrypted using the updated type 1 key and used to replace the encrypted type 2 key on the recording medium.