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:
Nov. 17, 2009
Filed:
Apr. 02, 2003
Shunsuke Furukawa, Tokyo, JP;
Yoichiro Sako, Tokyo, JP;
Tatsuya Inokuchi, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention provides a data processing method for encrypting or decrypting contents data using contents key data. The method comprises generating the reference information including data encrypted from contents key data using a plurality of device key data proper to a plurality of apparatus, by encrypting the contents key data using the device key data associated with those of the plural apparatus for which recording or reproduction is allowed, supplying the generated reference information along with the device key data to the plural apparatus, decrypting the contents key data from the supplied reference information, by the plural apparatus, using the device key data proper to the plural apparatus, and encrypting or decrypting the contents data using the decrypted contents key data.