Can you buy an older version of AutoCAD?

I want to buy a 2008 or 2007 version of autocad but I want everything legal and upfront. If I get one from say, ebay, what all do I need to have in order for it to be legal? Would I need some sort of authorization code from autodesk for it to work? I am not interested in any of the newer versions. Thanks in advance! Solved! Go to Solution.
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