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. 26, 2010
Filed:
Jul. 25, 2006
Atsumu Soda, Tokyo, JP;
Atsumu Soda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An information processing apparatus decrypts, using meta data, encrypted data obtained by encrypting stream data including successive frames according to an encryption method in which, when the stream data is sequentially encrypted on a frame-by-frame basis, a key used for encrypting each frame is updated according to a predetermined rule. The meta data includes the plurality of keys used for encrypting the stream data and update information for identifying update timings of the keys. The apparatus includes a decrypter for acquiring the encrypted data and decrypting each frame using the key used for encrypting the frame and a meta data acquirer for acquiring the meta data and delivering one of the keys corresponding to the frame to the decrypter in accordance with the update information. The meta data acquirer includes a corrector for detecting an error in the update information and correcting the update information if an error has occurred.