Introduction Editor's Note Peter R. Wurman i Feature Articles Specifying Conflict of Interest in Web Services Endpoint Language (WSEL) Patrick C. K. Hung 1 Overview of Some Patterns for Architecting and Managing Composite Web Services B. Benatallah, M. Dumas, M.-C. Fauvet, F. A. Rabhi, and Quan Z. Sheng 9 Digital Rights Management for the Online Music Business Sai Ho Kwok 17 Interoperability of Peer-To-Peer File Sharing Protocols Siu Man Lui and Sai Ho Kwok 25 ISSN 1551-9031