Could be OK
As I understand things, FJJP is correct and the option does exist for local builders to operate quite legally as described. Unfortunately it used to be indistinguishable from the illegal copies that also abounded.
I beleive XP has a check somewhere that you can invoke, and this will confirm that your software is valid or not.
Also, there are various freeware utilities around that will extract the license key for you from installed software.