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:
Apr. 13, 2010
Filed:
Nov. 22, 2005
Jean-michel Puiatti, Châtelaine, CH;
André Nicoulin, Lausanne, CH;
Nicolas Fischer, Versoix, CH;
Guy Moreillon, Orjulaz, CH;
Fabien Gremaud, Bussigny, CH;
Michael John Hill, Coppet, CH;
Jean-Michel Puiatti, Châtelaine, CH;
André Nicoulin, Lausanne, CH;
Nicolas Fischer, Versoix, CH;
Guy Moreillon, Orjulaz, CH;
Fabien Gremaud, Bussigny, CH;
Michael John Hill, Coppet, CH;
Nagravision S.A., Cheseaux-sur-Lausanne, CH;
Abstract
Example embodiments are directed to a digital audio/video (AV) data processing unit and a method of controlling access to the digital AV data. The processing unit of AV digital data includes a deciphering unit of the AV data, a decompression unit, an input/output interface of the processed AV data and communication device towards a security module. The deciphering and decompression units respectively include an encryption unit and a decryption unit, each having at least one personal key and a common encryption key. Deciphering the AV data using the control words and re-encrypting the deciphered AV data occurs only after a successful verification of the control word and the common key. After temporary storage, the re-encrypted AV data cannot be decrypted by the decryption unit unless the common key has been positively verified by the security module by way of a random number generated by the decryption unit.