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:
May. 08, 2012
Filed:
Nov. 02, 2006
Guy Moreillon, Bioley-Orjulaz, CH;
Nicolas Fischer, Versoix, CH;
Nikolai Keychenko, Lausanne, CH;
Joel Wenger, Mies, CH;
Guy Moreillon, Bioley-Orjulaz, CH;
Nicolas Fischer, Versoix, CH;
Nikolai Keychenko, Lausanne, CH;
Joel Wenger, Mies, CH;
Nagravision SA, Cheseaux-sur-Lausanne, CH;
Abstract
A method for protecting multimedia data exchanged between a multimedia processing device and a security module managed by a management center, the multimedia processing device receiving an encrypted multimedia data, decrypting the encrypted multimedia data and converting the decrypted multimedia data, said multimedia processing device including a personal key, the method comprising obtaining an identifier pertaining to an entity representing a group of multimedia processing devices, calculating a security key formed by a one-way function based on the personal key of the processing multimedia device and the entity identifier, transmitting this security key and the entity identifier to the security module connected to said multimedia processing device, calculating the security key using a one-way function based on the personal key of said multimedia processing device and the entity identifier, and using the calculated security key to secure the data exchanged between the multimedia processing device and the security module.