I am having trouble finding information about autodesk's autocad lt retirement policy. There is all sorts of sales hype around but no hardfacts. If I upgrade my lt2004 to lt2007, presumably I will have to get an authorisation code from autodesk. If I should need to reload the software, will I need a new authorisation code?. If so, after 3 years, when lt2007 is "retired" by autodesk, if I need to reload it and need a new authorisation code, will autodesk give me one?