In a guide on dvdrhelp it says (in relation to decrypting):
When you are ready to rip:
1.Clean your DVD with glass cleaner or a damp cloth.
2.Play your DVD on your PC for 30 seconds with PowerDVD or WinDVD to unlock your drive.
3.If you encounter an error while ripping with DVDDecrypter go to Tools->Settings->Device tab and enable Fast Error Skip,then go to I/O tab and enable Ignore Read Errors.
4.If DVDDecrypter doesn’t work then try SmartRipper or vice-versa.
5.If your drive reads slow(<4x) push and hold the Eject button for 3 seconds(works on some drives) or go to Device Manager->Hard Disk Controllers,remove all and reboot,this will reset your drives to DMA instead of PIO(WinXP bug).Another option is to use a “hacked” or “patched” firmware from a third party but install at your own risk.
wtf is he talking about “play it for 30 seconds to unlock your drive” ?