Why DVD Decrypter? DVD Decrypter is good in cases where DVD Shrink fails.
From the DVD Shrink instructions:
If you are suffering read errors or copy protection errors with a certain DVD, using DVD Decrypter usually solves the problem.
I suppose in most cases DVD Shrink could be used alone for reading, decrypting, shrinking, and writing. I have a friend who has one of those DVD/VCR combinations made by a member of the DVD forum which will only accept DVDs written in DVD-R(W) format and then only if everything is done exactly correct. He needs to use Nero to write the file system and the files on a DVD-R(W) disc just to get it to play. It will not accept the same files written on a DVD-R(W) by DVD Shrink. Many of the players made by the members of the DVD Forum, the DVD-R(W) group, seem the have difficulties playing anything but a pressed disc.
Edit: Typo corrected