Security in collaborative multimedia art communities

Abstract

We propose a system for organizing the creation and the interaction in multimedia environments that permit the collaboration among artists and audience. This system approaches security issues in multimedia content performing authorization and watermarking mechanisms. Authorization mechanism controls artist and audience operations in multimedia files based on a set of actions imposed on real-life scenarios. Digital watermarking mechanism handles copyright-protection and authentication issues that appear in multimedia systems applying a semantically secure watermark. The main contribution of such a watermark relies on the fact that it gives to the users the enhanced capability their ownership of the multimedia file not to be accomplished simply by detecting the bit pattern that comprises the watermark itself, but by showing that the legal owner knows a hard to compute property of the watermark. The strength of our system considers multimedia content not as an atomic digital entity, but as a part of a project with a specific workflow that applies watermarking techniques in all its parts.