Open the terminal
sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list
sudo apt-get update
sudo apt-get install medibuntu-keyring
sudo apt-get update
sudo apt-get install libdvdcss2 w32codecs
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source:http://linuxpoison.blogspot.com/2008/05/13578175808747.html