There was a time that there was no Vudu, believe it or not. The disks you bought either came with an UltraViolet code or an iTunes code. No choice for the consumer, but chosen by the distributor. I was forced to redeem certain codes for films I bought via UltraViolet rather than my preferred digital outlet. Never my favorite, I chose not to buy Blu-rays with UltraViolet unless I really enjoyed them. But the devil was in the details and sometimes I had to. Fortunately that library will be taken up by Vudu. But, as James noted, that's a situation where being in the region in which they were created is a plus. He doesn't have that option, so I feel for him.
Aren't/weren't Ultraviolet codes redeemable on VUDU, anyway?
We put our disks for movies we have on VUDU in a box in a closet that's easily accessable, in case anyone wants to borrow them. I haven't counted how many we have, but its easily more than 40. We have well over 300 non-VUDU disks. Mostly DVDs.