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. 21, 2013
Filed:
Mar. 12, 2009
Tomoyuki Haga, Nara, JP;
Yoshikatsu Ito, Osaka, JP;
Yuichi Futa, Osaka, JP;
Hideki Matsushima, Osaka, JP;
Takayuki Ito, Osaka, JP;
Tomoyuki Haga, Nara, JP;
Yoshikatsu Ito, Osaka, JP;
Yuichi Futa, Osaka, JP;
Hideki Matsushima, Osaka, JP;
Takayuki Ito, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A content playback device of the present invention includes a playback unitoperable to play back a content; a normal storage unitthat is not tamper-resistant; a secure storage unitthat is tamper-resistant; a first control sub-unitthat writes playback records indicating elapsed playback time of the content into the normal storage unit one by one at regular time intervals; and a second control sub-unitthat (i) writes monitoring records with respect to the playback records into the secure storage unitone by one at irregular time intervals and (ii) determines that the playback records stored in the normal storage unithave not been tampered with if a prescribed relation is satisfied between a specific time point obtained according to a latest one of the monitoring records and one of the playback records corresponding to the specific time point.