you’re not talking about protection. you’re talking about the native format of the disc.
you’ll have to actually convert the video.
DVDSanta will do this for you. Other forum members may be able to recommend other programs, but in the meantime dvdsanta is one you can look into.
maybe doing a search for “PAL to NTSC” would turn up some better results now that you know you’re after a format conversion as opposed to copy protection.
before you go through all that, I’d make sure the disc actually works first. does it play in your computer? if not, then the format is the least of your problems.
what kind of backup is it? did you make it? of what disc?
if you routinely buy out of region discs for home use, then you should really look into getting a region free or multi-region standalone unit so you don’t run into this issue.