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:
Oct. 13, 2015
Filed:
Jun. 15, 2009
Applicants:
Ryuji Nishida, Kawasaki, JP;
Yoshihiro Saga, Ichikawa, JP;
Kenichi Morikawa, Kawasaki, JP;
Kazuhiko Nakazawa, Kawasaki, JP;
Inventors:
Ryuji Nishida, Kawasaki, JP;
Yoshihiro Saga, Ichikawa, JP;
Kenichi Morikawa, Kawasaki, JP;
Kazuhiko Nakazawa, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06Q 99/00 (2006.01); H04N 7/167 (2011.01); H04N 5/913 (2006.01); H04N 21/2389 (2011.01); H04N 21/258 (2011.01); H04N 21/433 (2011.01); H04N 21/4385 (2011.01); H04N 21/4408 (2011.01); G06Q 20/12 (2012.01);
U.S. Cl.
CPC ...
H04N 7/1675 (2013.01); H04N 5/913 (2013.01); H04N 21/23895 (2013.01); H04N 21/2585 (2013.01); H04N 21/4334 (2013.01); H04N 21/43853 (2013.01); H04N 21/4408 (2013.01); G06Q 20/1235 (2013.01); H04N 2005/91364 (2013.01);
Abstract
Before a device key generation procedure is updated in response to execution of revocation, a recorded transport stream is decrypted using an unupdated device key and is stored in a memory unit after being re-encrypted. In this manner, broadcast programs that are recorded before the revocation can be viewed while maintaining a copyright protection function.