It's not personal. It has to do with sending IP's to people you don't know and wondering if they will get copied/mass produced and then used at stores. They all have unique ID's and if multiples of the same ID are used, the manufacturer can trace that coupon back to my IP address (my computer), and then c.c (or RP or SS or whoever), can block my IP.
I'm not making this up, I promise you. There are SD'ers on here that have had their accounts blocked for just this reason.
Never heard of this before. Thanks for telling me this. Must be careful