I think you are trading on some pretty thin ice, legally speaking. As far as I understand it, you cannot use the software legally because it is not registered to you. Remember, you don't own it, you only purchase a license to use it.
Also keep in mind that Autodesk is one of the more aggresive companies who are pursuing piracy. You probably don't want to mess with their legal department!
Dan
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)