Decrypter illegal? If not what is the best one to download?

I recommend you a free software which can help you convert Rip DVD and Convert Video and Backup DVD. It called "Next DVD Ripper".

http://www.google.com/search?hl=en&q=http%3A%2F%2F...

Next DVD Ripper is a free DVD ripper and video converter with easy-to-use graphicalinterface, fast converting speed, and excellent video quality. It can rip DVD movies and convert almost all video formats including DVIX, Xv iD, MOVE, RM, RM VB, MPEG, VB, DVD, MV, and AVI to MPEG-4 movie format for iPod, PSP, PS3, iPhone, XBox360, Zune, Apple TV, Archos, iRiver PMP, Epson Player, Creative Zen, Rubi Blue, Sony Walkman, Commodore PMX, Palm TX, Game Boy, SmartDisk, Windows Mobile Smart phone, Nokia, BlackBerry, Ketti, LG, Sony-Ericssonon, Samsung mobile phone, etc.

It is legal as long as you do it for yourself, because it is your property,

You can download free dvd ripper/decrypter here, http://www.dvdtopreviews.com/article/free-dvd-ripp...

This page lists some dvd ripper software for both windows and mac os

You can also have a look at this dvd ripping guide, it will show you how to do this

http://www.dvdtopreviews.com/how-to/rip-dvd-to-lap...

I like DVD Fab

http://www.dvdfab.com/

It's legal to make a backup of a DVD you own, for archival purposes (so if something happens to the original you have a backup) - http://www.law.cornell.edu/uscode/17/117.html

It's totally illegal to, say, borrow a friend's DVD and make a copy for yourself.

It's like a knife. It's legal to sell them, it's legal to own them, it's legal to cut meat with them - it's not legal to kill someone with one.