As a Linux user I've been wrestling with this.
Basically, there's a program out there called "libdvdcss" of questionable legality. It's distributed by VLC and works with the excellent VLC media player:
http://www.videolan.orgHere's the US legal problem in a nutshell:
libdvdcss is GREAT at reading DVDs. It's doesn't give a dang about region codes or copy protection. So it's *part* of a system for beating copy protection - and any complete copy protection beating system runs afoul of the DMCA.
Beating just the region coding does NOT, as near as I can tell.
So reading DVDs by way of VLC and libdvdcss should be no problem under US law - EXCEPT that VLC is so advanced, it's also got DVD "ripping" features.
Which means the combo on a Windows (or Linux) system is basically as illegal as an unregistered full-auto.
Odds of being prosecuted is low, UNLESS you plan on doing installations for other people, and you do politically unpopular stuff like I do...in other words, I won't be installing that combo on Linux systems any time soon.
Now. Under Linux, libdvdcss can be used with other movie players that don't have ripping capabilities. I have libdvdcss working with the Totem movie player, with no DVD rippers installed in my system. I've got region codes beat cold, but near as I can tell I'm clean under the DMCA.
I don't know of any video players under Windows that work purely as a reader with libdvdcss. That's not to say none exist, I just haven't looked. You may be able to duplicate my setup under Windows - otherwise, consider dual-booting and adding Linux to your system - I'll get you my recipe if you need it. Getting libdvdcss is a tad tricky because most in the US consider it legally iffy. There's a smaller group of us taking the position that libdvdcss is only part of a legal problem, if combined with a ripper. This is akin to "don't have a full-auto sear in the house if you also own a legal semi-auto AR15" due to BATF's views on the matter...