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:
Jun. 26, 2007
Filed:
Jan. 14, 2003
Applicants:
Toshio Kuroiwa, Kanagawa-ken, JP;
Seiji Higurashi, Tokyo, JP;
Inventors:
Toshio Kuroiwa, Kanagawa-ken, JP;
Seiji Higurashi, Tokyo, JP;
Assignee:
Victor Company of Japan Limited, Yokohama, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
A unidirectional function circuit generates a first encryption key according to the device identification information stored in a device identification information holding unit. Another unidirectional function circuit generates a second encryption key that depends on a write block address. A contents key generator generates a contents key using the first encryption key, second encryption key, and relation information. An encryptor records contents, which are encrypted using the contents key, onto a HDD.