The new DVDs from Twentieth Century Fox use a very aggressive copy-protection scheme which grabs command of your player and then wreaks havoc. I had this experience when I inserted the 50th Anniversary Edition of Oklahoma into a Sony DVP-NC80V player. First I was forced to sit through a violent and offensive anti-piracy message and then I discovered that my disc player was completely unresponsive. The remote control would not work and neither would any of the buttons on the player itself. I had to pull the plug in order to turn off the machine.I recommend that you purchase the London stage revival of Oklahoma and stay away from this release by Fox.