The development of new multimedia services and environments requires new concepts both to support the new working process and to protect the multimedia data during the production and distribution. This article addresses imagehideo authentication and copyright protection as major security demands in digital marketplaces. First we present a content-based signature technique for image and video authenticity and integrity. Based on this technique, we introduce a tool for interactive video authentication and propose contentfragile watermarking, a concept which combines watermarking and content-based digital signatures to ensure copyright protection and detection of integrity violation.

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Recently security has become one of the most significant problems for spreading new information technology. This article describes security demands in a distributed, digital video application. We want to give an introduction to security problems and want to set up specific design criteria in distributed multimedia environments in order to dispel acceptance problems of the new technology on the part of video producers, and to organize the digital marketplace more attractively. A technical approach to the transparent encryption of MPEG-2 Video is presented.

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