While the OP hasn't revisited, apparently, I have picked up a couple of scratch-marked commercial DVDs and have been spending the weekend with ISO PUZZLE and ISO BUSTER. Uselessly.
ISO PUZZLE, I forgot, has a Nero DLL requirement that, while we have several from Nero 6, don't seem to let ISO P function. It's a 2007 ReadMe File and other comments have mentioned this abject failure so I suspect this software's usefulness was finally decided by the developer. "Left it in beta, long ago."
ISO BUSTER is only 19 hours and 65% complete. Yawn. Hubby reminded me that, a few years ago, I did this and left it run for a weekend, but finally returned after two days and gave up. "Yes, buy another copy off of Amazon, and get it here much faster."
But my question is... has ANYONE truly got these packages to work? I was looking thru other sites with threads from 2003 thru 2010, and "success" in any endeavor is never mentioned by an OP. In fact, they all give up.
I think suggesting ISO PUZZLE is a terrible thing to do unless someone's going to supply the correct and functioning DLL with it.
ISO BUSTER's "replace with Zeros" or "replace with Random Bytes" should give an idea of the quality of the final product - "missing chunks of video/audio" - is going to be the best possible result this product offers.
If that's all a user has, though... well...