Ok, i work in a video store and with the increase in the purchasing of DVD players this Xmas, I have noticed that a few people lately have been phoning and saying the DVD they have rented is not working on their DVD player. Stuff is coming up saying "This disc cannot be played", or the disc just wont play, or things to that effect. There must be some players that are obviously lower end brands that won't play some dvd's. Can anyone enlighten me? Or does anyone have any place I can find these things out.