What does that mean? I tried to copy 2 differnet dvd's using dvd shrink and dvd decrypter together and I get that message during the "shrink" stage. How do I copy my dvd using just dvd decrypter?
it usually means dirty or scratched dvd. you can only use just decrypter if the disc is a dvd 5 otherwise it needs shrinking to fit on a dvdr.
Try entering "cyclic redundancy check" in this site's search function. It's been asked a thousand times.