Most DVD titles are designed to prevent you from making copies.
The first preventative measure is encryption. Most DVD titles are encrypted, which prevents you from either copying them to your hard drive, or if you manage to do so, being able to play the resulting files. DVD Shrink overcomes this problem with built-in decryption algorithms.
The next problem is not so easy. Most DVD video titles are simply too large to fit, without modification, onto a single recordable DVD-R disk. DVD Shrink overcomes this problem by modifying or "shrinking" the data from your original DVD.
DVD Shrink provides two ways of shrinking your DVD disk. These are re-authoring and re-encoding. You can use one, or the other, or for maximum "shrinkage", both combined.