If you own a legitimate copy of AutoCAD 2007, you may face hurdles today: Re: Having Trouble Loading Autocad 2007 - Forums, Autodesk
: A secondary code generated by Autodesk after the user provided a Request Code from the installed software.
Understanding AutoCAD 2007 Licensing: Serial Numbers and Activation
: A code used to differentiate between standalone products and those sold as part of a suite.