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. 14, 2015
Filed:
Oct. 03, 2013
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Shinichi Matsukawa, Suginami-ku, JP;
Taku Kato, Kamakura, JP;
Akihiro Kasahara, Sanbu-gun, JP;
Hiroshi Suu, Chigasaki, JP;
Atsushi Kondo, Yokohama, JP;
Jun Sato, Kokubunji, JP;
Akira Miura, Sagamihara, JP;
Hiroyuki Sakamoto, Ome, JP;
KABUSHIKI KAISHA TOSHIBA, Minato-ku, JP;
Abstract
A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set.