System and method to prevent manipulation of transmitted video data

摘要

Example embodiments relate to a system to prevent manipulation of transmitted video data including an Integrated Receiver Decoder (IRD) receiving audio/video data and a display device. The IRD may include a device to transmit an HDMI compliant audio/video stream toward the display device. The system may further include a device to add an over-encryption layer to the HDMI/HDCP stream before reaching the display device and a device to remove the added encryption layer so as to recover the HDMI/HDCP stream, before processing the HDMI/HDCP stream by the display device.

主权项

1. A system to prevent manipulation of transmitted video data, the system comprising:
an Integrated Receiver Decoder (IRD) configured to receive audio/video data and to output the audio/video data within an HDMI/HDCP stream, the HDMI/HDCP stream being an HDMI compliant audio/video stream protected by an HDCP protocol layer; an encryption device configured to add an over-encryption layer to said HDMI/HDCP stream to obtain an over-encrypted stream, the over-encrypted stream being encrypted with the over-encryption layer and the HDCP protocol layer, the encryption device including a transmitter configured to transmit the over-encrypted stream, the encryption device being housed in a converter box that is external to the IRD; a decryption device configured to receive the over-encrypted stream and to remove the added over-encryption layer so as to recover said HDMI/HDCP stream; and a display device configured to receive and process the recovered HDMI/HDCP stream, wherein the converter box includes,
an extraction device configured to extract a packet from the HDMI/HDCP stream entering into the converter box, anda feedback device configured to send a signature of the extracted packet to the IRD.