When i rent a dvd and use dvdshrink to copy and burn it, it only seems to play on some dvd players. Im using dvd-r media. Yet when i buy copies from my uncle who brings back loads from Thailand, they usually work on all dvd players. What am i doing wrong? Iv tried using dvd+rw media and again it worked on a few dvd players but now all. Is there a way to make dvd-r work on all players becuasemi just brought 50 and if i can't then there useless :(