Joint Fingerprint Embedding and Decryption for Video Distribution

A secure video distribution scheme is proposed, which embeds a fingerprint code into the video content during decryption process. At the server side, the video content is scrambled by motion vector (MV) encryption. At the customer side, the video content is decrypted and fingerprinted simultaneously under the control of both the key and the fingerprint. For MV decryption and fingerprint embedding are both based on MV modification, they are combined into homogenous operations. Thus, it is difficult for attackers to get the clear video content from the gap between the decryption operation and the embedding operation. To counter collusion attacks, the fingerprint can be encoded with collusion-resistant codes before being embedded. Furthermore, by improving the watermarking strength, the colluded copy's quality will be reduced greatly, which makes collusion attacks out of work.