How can people sell USED versions of NIS2009

Hi

I came across this   

 http://www.amazon.com/gp/offer-listing/B001E0RZ3U/ref=dp_olp_used?ie=UTF8&condition=used

How safe is it to even contemplate buying a used version of NIS2009?Not that I would but it does not make sense about NIS being used!

Any thoughts or opinions?