Originally posted by Jacko what if people loose there email etc...?!
A person who prints their verification email and loses it would have the same troubles keeping up with an actual receipt. Basically - the idea is good but mostly pointless as the email serves as a reciept and should be treated as one (printed and filed away).
And as said twice before, adding a physical aspect to a virtual product will make the product more expensive for everybody due to overhead. There's a similar discussion at vB.com about why vB isn't sold in a box.
Ok I'm running a free certificate production service, everyone PM me your license number and passwords, and I will be more than happy to print you off a lovely license