From the Official Site :
DVDRemaster is an utility for Mac OS X to recompress large (unprotected/unencrypted) DVDs so that they fit on standard DVD5. DVDRemaster can work in two modes.
It can either preserve all tracks (including menus, multiangle, commentaries, other languages, ...) or work in "Movie Only" mode where everything but the main feature is discarded, thus leaving more space for the main feature and a better quality of image.
Advanced users will appreciate the Pro version, which lets you choose exactly which video and audio tracks you want to copy.
The official change log for version 6.3.2 is as follows:
- Introduced a help manual accessible from the Help menu
- Improvements to the Japanese translation