Install DVD decryption library script

wget http://installit.googlecode.com/hg/install.dvd.sh -O - | bash -

#!/bin/bash

# add repository
sudo wget http://www.medibuntu.org/sources.list.d/$(lsb_release -cs).list -O /etc/apt/sources.list.d/medibuntu.list

# update repository
sudo apt-get update -qq

# get keyring
sudo apt-get -y --force-yes install medibuntu-keyring

# install libdvdcss
sudo apt-get install -y --force-yes libdvdcss2

Other method:
sudo apt-get install ubuntu-restricted-extras
sudo /usr/share/doc/libdvdread4/install-css.sh

Links
http://download.videolan.org/pub/libdvdcss/

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