DVD RAW writing?

Why is not possible writing in raw mode into a dvdr/rw?
I have bought Silent Hill 3 for PC in dvd version and it has Securom 4.85 as tell me clonyxxl when I install it. In order to get a backup on my hdd, Could I extract a BWA file from it in order to mount the phisical file with the image of the game at Alcohol 120% or Daemon Tools?

Raw writing has nothing to do with dpm on dvd (which securom uses). I’ve been told by venom386 that dvd dpm is not precise/accurate enough to make a useful image. It might be enough for securom to check, but not enough for an image to be read.