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:
May. 19, 2009
Filed:
Nov. 28, 2003
Tadashi Kojima, Yokohama, JP;
Hisashi Yamada, Yokohama, JP;
Taku Kato, Fuchu, JP;
Atsushi Ishihara, Yokohama, JP;
Kazuhiko Taira, Yokohama, JP;
Tadashi Kojima, Yokohama, JP;
Hisashi Yamada, Yokohama, JP;
Taku Kato, Fuchu, JP;
Atsushi Ishihara, Yokohama, JP;
Kazuhiko Taira, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In a content management method, content data is encrypted by a first key, the first key is encrypted by plural types of second keys, the encrypted first key is multiply encrypted by a third key, and the third key is encrypted by a fourth key. These encrypted content data, a medium key which is the first key encrypted by the second key and a move key which is a first key multiply encoded by the second and third keys are recorded in a recording medium, the third key encrypted by the fourth key is recorded in a security region. This management method is managed by the move key and the medium key.