This means that I can use it freely, but... where is the source code?  Virtual Distro Dispatcher is an integration of various GPL and Free software. You can certainly use it as you like but it's strictly required you respect the license. At the moment, the available source code is limited to the software which composes VDD, such as LTSP, XEN, UML, X.org, Xephyr and the base system. We are also working at the GUI. The source code will be available soon, under GPL license, of course.