"With the development of the Internet and multimedia processing techniques,
the protection of multimedia content has become increasingly important.
While cryptographic encryption is a powerful tool for access control and
confidentiality protection, the protection usually terminates once the content
is delivered and decrypted.
Digital Fingerprinting is an emerging technology to protect
multimedia from unauthorized redistribution. It embeds a unique ID into each
user’s copy, which can be extracted to help identify culprits when an
unauthorized leak is found. A powerful, cost-effective attack is the collusion
attack from a group of users, where the users combine their copies of the same
content but with different fingerprints to generate a new version. If designed
improperly, the fingerprints can be attenuated or even removed by the
The research team at University of Maryland led by Dr. Min Wu has
been doing work in this particular field of content protection
technology, looking into different issues such as theory, design,
attacks and counter-attacks (anti-collusion) for fingerprinting.
Their published research papers are documented at
http://www.ece.umd.edu/~minwu/research/ACC_fingerprint.html and all
papers are downloadable.