hi, i'm at my first attempt of dvd backup, i'm trying to follow the dvd-9 to dvd-5 guide on this site.
when i start ripping with dvd decrypter, every vob it reads it says:

"title authentication failed!
device ...
reason: authentication success flag=false"

i've tried to stay at pc and click ok every window error, when finished i've tried both dvd2one and instantcopy, they say they are unable to open the file; i don't know if the two problems are related.
i'm quite desperate, please help!
thanks to everybody, jeremy.