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This document describes an architecture how QoS-enabled virtual private networks over the Internet can be built and managed. The basic technologies for secure VPNs and for QoS support are introduced in the first chapter. The second chapter describes our vision of a QoS-enabled VPN service over the Internet. It also discusses in detail the required components and their interactions of an appropriate architecture. Based on this architecture, a demonstrator will be implemented. Chapter 3 presents the simplified implementation scenario and some implementation details in order to achieve secure and QoS-enabled VPNs. The work described in this document is part of a deliverable to the CATI [1] project funded by the Swiss National Science Foundation.