Play DVD under Debian Wheezy

Edit /etc/apt/sources.list and add this line....

deb http://www.deb-multimedia.org wheezy main non-free
(refer to this link for more info )

Than give these command from command line....

apt-get update
 apt-get upgrade
apt-get install deb-multimedia-keyring
apt-get upgrade
apt-get update
apt-get install libavcodec54 libdvdcss

Now you are ready.....
Last thing.....
I suggest to use VLC as player
So if you have not installed it, give(from command line):

apt-get install vlc

Bye...