The above reply is 100% correct.
Ripguard reportedly first appeared on Disney's "Madagascar" DVD (at least in Region 1).
"Madagascar" was released quite some time after "Bewitched." The DVD of "Bewitched" was already on the store shelves, and had been discussed at length on many of these forums for quite some time by the time Ripguard even appeared.
The DVD "Bewitched" is Sony's ARccOS protection. Like any Sony ARccOS disc, DVDShrink by itself will fail and give you a meaningless error message. The DVD "Bewitched" is a minor variation of ARccOS which came a bit later, which means that that it also cannot be ripped by DVDDecrypter without some sort of help. Do a search, and you will find lots of discussion on this disc, from many months ago. You will also find many possible ways of backing up your original disc. Or, look at some of the posts above, and see if any of those possibilities will yield a clue.
But to clarify, and to correct the thread title, the DVD of "Bewitched" is most definitely NOT Ripguard. It is ARccOS.