Patent ID: 9215505
Filing Date: 2015-12-15
Classification: G06F,H04N

Abstract:
1. A method for processing a digital data stream comprising video content data scrambled by a first algorithm using at least one control word, and audio content data encrypted by a second algorithm using a system key, said digital data stream further comprising encrypted control messages containing the at least one control word, the digital data stream being input by a receiver comprising a video descrambler device, the receiver being coupled to a primary secure device and a secondary secure device, the method comprising the steps of: extracting by the receiver a control message from the digital data stream; transmitting to the primary secure device the extracted control message; receiving a decrypted control word by the receiver from the secondary secure device; descrambling the video content data using the first algorithm and the control word; transmitting to the secondary secure device the encrypted audio content data; receiving the watermarked decrypted audio content data by the receiver from the secondary secure device; and outputting by the receiver the descrambled video content data and the watermarked decrypted audio content data to a display device.