Patent ID: 9749129
Date: 2017-08-29
CPC Classifications: H04L

Claim:
1. A method for conditional access to digital content comprising: encoding, by a broadcast server of protected digital content, a digital content M and generating, by the broadcast server, an encoded content C using an encoding function implemented by the broadcast server; generating, by said broadcast server of protected digital contents, an encrypted control word c whose plaintext k is intended for use by a plurality of subscriber processing entities for decoding said encoded content C; transmitting, by said broadcast server, said encoded content C and encrypted control word c for subscriber entities through a distribution network connected to said broadcast server; receiving, by each subscriber processing entity, said encoded content C and encrypted control word c; generating the plaintext k of the encrypted control word c, by each subscriber processing entity, from the encrypted control word c; decoding, by each subscriber processing entity, the encoded content C and generating a content M from a decoding function and k; retrieving said content M using an interface adapted to said content; wherein: the broadcast server generates the encrypted control word c from: each subscriber processing entity generates a control word k from: