How do they track those serial number anyway? (Score 1)

The screeners that I've seen seem to have been factory pressed, not DVD-R. I can't imagine how they can serialize the disks unless they are using DVD-R disks. Has anyone seen any recent screeners? Have they switched them all to DVD-R disks? That seems like a more expensive undertaking. I bet the smaller movie distributors are going to send out factory-produced, identical disks and not care about privacy. The indie movies are better anyway.