AutoCAD?

Anyone know about AutoCAD? Siani wants to run it for sorting out home stuff, it has to be the full version, and all I'm finding on eBay are pirated versions. Which is fine and dandy if they work, TBH, but I'm not paying sensible money for one when I could give someone sensible money for a used legit version.

Does 2000 need a Dongle to work?
Do earlier dongles allow cheap upgrades?

Anything post R14 is suitable. I've found one which looks alright but there's no mention of a dongle :/