I was just going to add the Product Key being located in the registry may apply to
2k, as well. I believe that changed with XP and Activation.
Plus, I also forgot to note that on OEM systems "OEM" is actually part of the code.
As for the COA stickers, I was referring to the big box mfgrs. but you'd know more
about that.
Blocking Unwanted Parasites with a Hosts File