Patent ID: 8023693
Filing Date: 2011-09-20
Classification: G11B,H04N

Abstract:
1. A method for authenticating a video file containing a watermark comprising: testing the video file to determine whether the video file is legitimate, the testing comprising: determining whether two or more hash units in the video file correspond to hash units of a known legitimate video, and if they do, identifying the video file as not legitimate; determining a number of different consumers requesting digital certificates for video files with the same hash units, and if the number of consumers exceeds a predetermined threshold, identifying the disc as not legitimate; in the event the testing results in the video file being determined as legitimate, embedding a signed digital certificate in the video file; reading the video file in a video player; verifying the signed digital certificate in the video player; and instructing the video player to not check for the watermark in the video file if the signed digital certificate is verified.