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:
Dec. 26, 2006
Filed:
Mar. 08, 2002
Kenjiro Ueda, Kanagawa-ken, JP;
Takayuki Sugahara, Kanagawa-ken, JP;
Wataru Inoha, Kanagawa-ken, JP;
Seiji Higurashi, Tokyo, JP;
Toshio Kuroiwa, Kanagawa-ken, JP;
Kenjiro Ueda, Kanagawa-ken, JP;
Takayuki Sugahara, Kanagawa-ken, JP;
Wataru Inoha, Kanagawa-ken, JP;
Seiji Higurashi, Tokyo, JP;
Toshio Kuroiwa, Kanagawa-ken, JP;
Victor Company of Japan, Limited, Kanagawa-ken, JP;
Abstract
The present invention relates to an encryption method for encrypting information including a series of multiple unit blocks, one at a time, a decryption method for decrypting multiple encrypted unit blocks, one at a time, and a recording and reproducing apparatus that uses those methods. The seed of an encryption key for encrypting each unit block and the seed of an encryption key for decrypting each encrypted unit block, which are used by those methods and the recording and reproducing apparatus, are based on a unit block that is one or more unit blocks before the current unit block in a reproduction order or on information generated by encrypting one or more unit blocks before the current unit block. Alternatively, the seed of an encryption key for encrypting each unit block and the seed of an encryption key for decrypting each encrypted unit block are information based on an encryption key for encrypting a unit block before the current unit block in a reproduction order.