DVD Decrypter in ISO mode,

DVD Decrypter in ISO mode, rip the entire disc, reburn it [or use magicISO or similar to extract the files], it *should* work. I ripped a broken [literally, one side of the disc was snapped through] DVD this way for a client where I used to work, got it playing.

Note: Set it to retry once and then continue on [I forget the exact options]. This will take a LONG time, but it should work.