What do you mean by you do not have to register the warranty? On the warranty card it says that you must register the product within 10 days of purchase.
In the UK you only have to register your purchase on-line within 30 days, there is no requirement for you to ever fill in the warranty card that comes in the box, although it would need to be sent with your proof of purchase, to the service centre when needed. The rules in other countries may well be different for the reason I gave above. I'm not sure if this is what Prolmages was referring to?