If you are using AnyDVD ,
I would use AnyDVD as you always have .
In most cases ,
AnyDVD will handle any 'bad sector protection' removal
on it's own -
without the CPRx enabled .
In some cases using 'both' might cause undesirable results .
In some cases using 'both' together - produce more desirable results
It's going to take some trial and error to learn exactly :
When it's better on .....When it's better off
( using CPRx with AnyDVD ) .... because every "Title" is a little different .
I couldn't even give you a specific instance , as of yet ,
where I found a definitive conflict between the two , but theoretically it's possible .
With "When a Stranger Calls" - I found a slightly better back-up with CPRx enabled;
Although the AnyDVD alone version did well also .
CPRx is mainly to benefit those who use the newly updated DVD43
DVD43 no longer tries to handle any 'bad sector' protections ;
This falls on 1Click now - hence CPRx
If your using DVD43 - You must enable the CPRx
If your using AnyDVD , you have two options ...CPRx=On or CPRx=Off