Patent ID: 8488794
Filing Date: 2013-07-16
Classification: G06F,H04N

Abstract:
1. A method for access control to a content supplied to a reception terminal by an operator, with which an access management unit is associated, the method comprising: a conditioning phase of the content by the operator and a usage phase of the content by the terminal; wherein the terminal is configured to store three doublets composed of a current key K wherein the conditioning phase comprises: a) breaking down a duration of the content into N time segments each being associated with one identifier S b) scrambling the content using a sequence of control words CW c) encrypting each control word CW d) transmitting the scrambled content to the terminal during each crypto-period CP the usage phase comprises, on reception of the ECM message: e) the terminal analyzing data D f) if data D g) if the data D h) if the data D wherein the data D