Keygen Autocad 2004 Keygen For AutoCAD Software?

Keygen for AutoCAD software? - keygen autocad 2004

I am interested in the purchase of AutoCAD software, a friend told me to buy online an OEM version for much less. He told me that everything that you need a crack, and you get a valid license for the software. Is that true? Would not that be a valid license or a used copy?