Hi madara. What's BTAS?
I have successfully backed up my purchased copy of Angel Sanctuary DVD with DVd Decrypter and Shrink, and it works fine. With Shrink, I just deselect the English audio and extras, and then make an ISO w/ Shrink.
It plays fine in my DVD player, and the subs can be turned off.
P.S. Angel Sanctuary = 3 episode OAV.