With ICT increasingly becoming the main basis for community communication and cooperation, security, trust, and privacy protection are commonly accepted as core aspects of system design and operations. Starting with a representative example illustrating the resulting challenges, this talk will then give an overview of major legal requirements with the focus on privacy protection. Against this background the feasibility of security and trust mechanisms will be discussed in the context of communities that need to share information and have to cooperate in multiple ways to reach their common goals.

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