Method for securing a tv broadcast event

H - Electricity – 04 – N

Patent

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H04N 7/167 (2006.01)

Patent

CA 2557505

The invention relates to a solution for preventing modification of conditions of access to encrypted multimedia content. Said objective is obtained by a method for securing multimedia content by means of control words, wherein the use of said multimedia content by user units is subject to access conditions. The method comprises the following steps: generation of a pseudo random number, formation of a control block by associating the pseudo random number and access conditions, calculation of the control word by application of a single-directional function to the control block, use of the control word to encrypt the event, transmission of the control block to user units.

Le but de la présente invention est de proposer une solution pour empêcher la modification des conditions d'accès à un contenu multimédia encrypté. Ce but est atteint par une méthode de sécurisation d'un contenu multimédia par des mots de contrôle, l'utilisation de ce contenu multimédia par des unités d'utilisateurs étant soumis à des conditions d'accès, cette méthode comprenant les étapes suivantes: génération d'un nombre pseudo-aléatoire, formation d'un bloc de contrôle par l'association du nombre pseudo-aléatoire et des conditions d'accès, calcul du mot de contrôle par l'application d'une fonction unidirectionnelle sur le bloc de contrôle, utilisation du mot de contrôle pour encrypter l'événement, transmission du bloc de contrôle aux unités d'utilisateurs.

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