Patent ID: 8831219
Filing Date: 2014-09-09
Classification: H04L,H04N

Abstract:
1. Method of transmitting at least one additional piece of data D in a list of access control words CW i to a scrambled content transmitted by a content server of an operator to a user equipment ( 2 ) including a reception terminal ( 4 ) associated with a security processor ( 6 ), each control word CW i of said list being designed to descramble said contents during a determined cryptoperiod, comprising the following steps: a) prior replacement of at least one of the control words of said list with a resulting value X resulting from the treatment of the additional piece of data D by a function G having a dual function H with said function G and said replacement of the control word being executed in the security processor ( b) retrieving said additional piece of data D by treatment of said magnitude X by dual function H; c) capturing the retrieved additional piece of data D using an observer terminal ( d) analyzing the retrieved additional piece of data D to determine a security processor that is contributing to pirating; wherein said additional piece of data D is a unique identifier UA of the security processor (