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:
Mar. 01, 2011
Filed:
Jul. 26, 2007
Masao Nonaka, Osaka, JP;
Yuichi Futa, Osaka, JP;
Toshihisa Nakano, Osaka, JP;
Kaoru Yokota, Hyogo, JP;
Motoji Ohmori, Osaka, JP;
Masaya Miyazaki, Osaka, JP;
Masaya Yamamoto, Osaka, JP;
Kaoru Murase, Nara, JP;
Senichi Onoda, Osaka, JP;
Masao Nonaka, Osaka, JP;
Yuichi Futa, Osaka, JP;
Toshihisa Nakano, Osaka, JP;
Kaoru Yokota, Hyogo, JP;
Motoji Ohmori, Osaka, JP;
Masaya Miyazaki, Osaka, JP;
Masaya Yamamoto, Osaka, JP;
Kaoru Murase, Nara, JP;
Senichi Onoda, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.