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. 06, 2010
Filed:
Dec. 03, 2002
Andre Codet, Rennes, FR;
Pierre Fevrier, St. Sulpice la Foret, FR;
Noel Fontaine, St. Gilles, FR;
France Telecom, Paris, FR;
Abstract
An apparatus and associated methodology are provided for distributing individual keys for deciphering scrambled digital data transmitted by a broadcasting system to a plurality of terminals connected to a data exchange network. The broadcasting system includes at least one portal designed to provide the individual keys, at least one scrambling platform and at least one server designed to broadcast the scrambled data. The scrambling period of the data is divided and transmitted into a succession of encoding periods CP, each defining a period of validity of an individual key Ki. A set of individual keys are supplied at each connection of a terminal to the portal. The set of individual keys includes at least one key corresponding to the encoding period CP, and at least one key corresponding to the encoding period CP+1. The terminal has also provided the date of a future connection to collect a set of deciphering keys corresponding to at least a future encoding period if the continuation of the access is authorized.