On the design of copyright protection protocols for multimedia distribution using symmetric and public-key watermarking

The advent of the Web, electronic commerce and the creation of electronic distribution channels for multimedia content have brought new challenges regarding the protection of intellectual property. As it has become increasingly difficult to protect the distribution medium against copying, techniques for asserting the copyright on information have gained in importance. We review the requirements of practical copyright protection schemes and survey protocols that use symmetric and public-key watermarking algorithms.