Collusion Secure Scalable Video Fingerprinting Scheme

Video fingerprinting is a technology to prevent multimedia piracy. Fingerprint codes identify each user uniquely and are embedded in video through robust watermarking techniques. A powerful class of attacks in multimedia fingerprinting is known as collusion attacks, where a group of users each having a copy of the same multimedia content with different fingerprints, combine their copies to form an unmarked copy. Orthogonal modulation and code modulation are the major techniques in fingerprinting. The common method of code design is based on Balanced incomplete block design (BIBD). In both the methods for large number of users even a small fraction of the total colluders cannot be detected. This paper proposes a video fingerprinting algorithm that is resistant to collusion attacks for a large user group. The BIBD matrix is modified to form fingerprinting codes that are collusion resistant even if all the users collude. Each bit of the code is inserted in a separate video frame. This enables to represent the fingerprint code by only two orthogonal signals and improves the colluder detection for large user group.