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. 11, 2011
Filed:
Feb. 12, 2007
Applicants:
Henri Kudelski, Chexbres, CH;
Joël Conus, Echallens, CH;
Inventors:
Henri Kudelski, Chexbres, CH;
Joël Conus, Echallens, CH;
Assignee:
Nagra Vision S.A., Cheseaux-Sur-Lausanne, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/08 (2006.01); H04L 9/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention relates to a method for the transmission of management data to at least one multimedia unit or a group of multimedia units. This method is characterized in that said management data is sent in the form of at least one authorization message encrypted by means of at least one synchronization key (SK), the sending of said at least one authorization message being repeated cyclically and intended for said multimedia unit or said group of multimedia units, and in that the synchronization key is modified at least during each cycle.