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:
Sep. 02, 2008
Filed:
Oct. 27, 2001
Applicants:
Shigeki Kamiya, Tokyo, JP;
Masami Yamashita, Tokyo, JP;
Inventors:
Shigeki Kamiya, Tokyo, JP;
Masami Yamashita, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/08 (2006.01); H04N 7/167 (2006.01);
U.S. Cl.
CPC ...
Abstract
A data delivery system providing multipoint delivery of encrypted digital data to specific destinations. A plurality of pieces of key information are generated on the basis of an encryption key specific to each digital data item to be delivered. The multiple pieces of key information are delivered over routes which differ from the routes used to deliver the digital data and which further differ from each other. Physically different media or transmission over a network at different times are used to separately transmit different sets of key information.