"The Terminal Services Licensing service works with Terminal Server to provide, catalog, and enforce license policy among Terminal Server clients. The Microsoft Windows Server 2003 Terminal Server Licensing white paper examines the key features and components of the Terminal Services Licensing service and explains how this service affects computing in an enterprise environment."

Click this link http://www.microsoft.com/windowsserver2003/docs/termservlicensing.doc to download the white paper.