Patent ID: 8336106
Filing Date: 2012-12-18
Classification: H04N

Abstract:
1. A method to control access to conditional access audio/video content played on a digital video recorder associated with a security module, the audio/video content being formed by at least an advertisement section and a main content section intended to be watched at time different from a time at which the advertisement section is watched, the method comprising the steps of: receiving by the security module an initial message relating to the audio/video content, the initial message comprising an identification of the audio/video content and creating a record comprising the identification of the audio/video content and initialized control information if no control information is stored in the security module when the initial message is received; receiving by the security module a first message relating to the advertisement section of the audio/video content, the first message comprising the identification of the audio/video content and updating information and updating the control information related to said identified audio/video content in the security module in accordance with the updating information, said first message being received while the digital video recorder is playing the advertisement section; receiving by the security module a second message included in the main content section of said audio/video content and comprising the identification of the audio/video content and condition information relating to the stored control information; verifying that the stored control information satisfies the condition information contained in the second message and returning to the digital video recorder an authorization signal allowing access to the main content section of the audio/video content if the stored control information satisfies the condition information.