Invited Talks -- Digital Fountains and Their Application to Informed Content Delivery over Adaptive Overlay Networks -- Securing the Net: Challenges, Failures and Directions -- Regular Papers -- Coterie Availability in Sites -- Keeping Denial-of-Service Attackers in the Dark -- On Conspiracies and Hyperfairness in Distributed Computing -- On the Availability of Non-strict Quorum Systems -- Musiā¦