| 摘要 |
The aim of the invention is to provide a solution to ensure that the content sent by the IRD is the content effectively displayed on the screen. It is then proposed a system to prevent manipulation of transmitted video data comprising an Integrated Receiver Decoder (IRD) receiving audio/video data, a display device (TV), said IRD comprising means to transmit an HDMI compliant audio/video data stream toward the display device. This system comprising: - means to define a variable area at a location of the image displayed on the display device, - means to store reference data corresponding to video data of said area which are sent to the display device. - means internal or external to the display device to extract the actual displayed video data of said area, - means to send, to said IRD, test data determined from said extracted video data, - means to compare said test data with said reference data, - means for switching an operating mode of the system from a standard mode to a disrupted mode in case of difference resulting from this comparison. |
