I looked at the site.
Seems like a waste of money - to me (i.e., IMHO). Snake oil, as far as I'm concerned.
No software can protect against truly damaged disks, and I'd imagine that you'd want to make regular backups anyway, so one damaged file shouldn't be too hard to find on another disk.
Yes, I'm sure it uses error correction to help reduce risk. But... I'm skeptical that it would actually in any way be worth its cost.
Edit: I re-read the site and looked at the blog. My opinion has improved. I'm not sure it's worth the cost, though - I mean, DVD's are well under a dollar now, and it seems pretty cost effective to just burn them more often, but... it's at least an interesting concept.