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:
Mar. 04, 2014
Filed:
Feb. 14, 2006
Applicants:
Bruno Tronel, Courbevoie, FR;
Franck Baudot, Velizy, FR;
Inventors:
Bruno Tronel, Courbevoie, FR;
Franck Baudot, Velizy, FR;
Assignee:
Viaccess, Paris la Defense Cdx, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N 7/167 (2011.01); H04L 29/06 (2006.01); H04L 9/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
This method of receiving a multimedia signal scrambled by means of a control word uses a first cryptographic entity that can be connected to any one of P second cryptographic entities to form part of a device for receiving the scrambled multimedia signal. Only second cryptographic entities of a group of N second cryptographic entities selected from a wider set of P second cryptographic entities use a session key obtained by diversifying a root key identical to the root key used to obtain the session key of the first cryptographic entity.