What happens when you sell your P3? (Score 1)

My problem with this is that I will probably sell a P3 I buy now, someday. Now, I have to rely on a potentially large number of vendors (or whoever) figuring out that the ids don't match the software because I upgraded my processor (God help us). What'll I have to do? Mail in the proof-of-purchase? Will this polute upgrades?

I'm not getting a warm-and-fuzzy feeling.