This volume of the Lecture Notes in Computer Science series contains the set of papers accepted for the two co-located NGC/ICQT2003 workshops, i.e., the 5th COST 264 International Workshop on Networked Group Communications (NGC) and the 3rd - ternationalWorkshopon InternetChargingandQoSTechnology(ICQT),bothof which took place at the University of the Federal Armed Forces Munich (UniBwM), Germany and were hosted by the Information and Systems Laboratory, IIS. NGC2003wasthe ?fth workshopin a continuingseriesof highlysuccessfultech- cal meetings on group communications within the framework of the COST Action 264 ¿Networked Group Communications,¿ following previous events in Pisa, Italy, 1999, Stamford, USA, 2000, London, UK, 2001, and Boston, USA, 2002. ICQT2003 was the latest edition of a vivid workshop on Internet economics and charging technology; previous events took place in the framework of the Annual Meeting of the German - ciety for Computer Science (GI) and the Austrian Computer Society in 2001 in Vienna, Austria, and in Zuri ¿ ch, Switzerland in 2002, co-located with the QofIS2002 workshop.

Includes supplementary material: sn.pub/extras

Networked Group Communications (NGC).- User-Interest Driven Video Adaptation for Collaborative Workspace Applications.- Improving Efficiency of Application-Level Multicast with Network Support.- An Adaptive Method for Dynamic Audience Size Estimation in Multicast.- Anycast in Locality-Aware Peer-to-Peer Overlay Networks.- Scalable Application-Level Anycast for Highly Dynamic Groups.- Topology-Centric Look-Up Service.- Service Differentiation in Peer-to-Peer Networks Utilizing Reputations.- Adding Structure to Unstructured Peer-to-Peer Networks: The Role of Overlay Topology.- Building Semantic Peer-to-Peer Networks upon CAN.- Adding Reliable and Self-healing Key Distribution to the Subset Difference Group Rekeying Method for Secure Multicast.- Key Bundles and Parcels: Secure Communication in Many Groups.- EBM: A New Approach for Scalable DiffServ Multicasting.- Team Oriented Multicast: A Scalable Routing Protocol for Large Mobile Networks.- Generalized Multicast Congestion Control.- IP Multicast over Cable TV Networks.- Extremum Feedback with Partial Knowledge.- Design and Evaluation of a Low Density Generator Matrix (LDGM) Large Block FEC Codec.- Overcoming Last-Hop/First-Hop Problems in IP Multicast.- The Performance of Software Multicast-Reflector Implementations for Multi-player Online Games.- Performance Evaluation of Multicast for Small Conferences.- Scalable Support for Source Specific Multicast in Differentiated Services Networks.- Programming Overlay Networks with Overlay Sockets.- Enhancing Peer-to-Peer Parallel Data Access with PeerFecT.- Internet Charging and QoS Technology (ICQT).- An Approach to the Charging of Secure IP Multicast Services.- Accounting Mechanism for Membership Size-Dependent Pricing of Multicast Traffic.- A Low-Cost Packet Originator Verification for Metering at Access-Routers.- Problem Statement: Metering and Accounting in the Full-IP 4G Environment.- Incentive Based Inter-domain Routeing.- The Economics of Smart Routing and Quality of Service.- A Progressive Second Price Mechanism with a Sanction Bid from Excluded Players.- Capacitated Network Revenue Management through Shadow Pricing.