Abstract
In this paper, we use fingerprinting which is a technology for embedding the user’s identity, known as the fingerprint, before the distribution of content. Then the content is no longer protected by the access control. It is necessary that fingerprints are difficult to remove from the content because the evil users want to escape from the detection of fingerprinting. If we want to protect the delivered digital content, we often require the ability to trace and identify entities involved in the illegal redistribution of the content. Our fingerprinting method is block-based so that it can be used in the existing video standards, like MPEG 1/2. If there are many users, the fingerprints designed by BIBD are enough to meet the problem because of their dependence. From the detection results, our method is robust to many attacks in experiments and we can trace the users who distribute their copy illegally.