AnyDvd removes the copy protections from commercial DVDs.
DVDShrink transcodes DVD files, so that a DVD that is too large for a SL disc will fit on it. (some quality loss in return for the smaller size)
Generally AnyDVD is used to help get the DVD on your PCs hard drive, then DVDShrink is applied to the unencrypted DVD on your hard drive to make it small enought to fit on the SL disc.
Just click the autolinks in these posts to find the software downloads.