The CSS key sets are licensed to manufacturers who incorporate them into products such as DVD drives, DVD players and DVD movie releases.Most DVD players are equipped with a CSS Decryption module.
Installing libdvdcss2
First you need to install the libdvdread3 package using the following command
sudo apt-get install libdvdread3
Now download the libdvdcss2 library using the following command
sudo /usr/share/doc/libdvdread3/examples/install-css.sh
For Ubuntu 6.10 (Edgy Eft) users use the following command
sudo /usr/share/doc/libdvdread3/install-css.sh
If you want to download libdvdcss2 library manually you can download from here
For AMD64 Users
First you need to install the following packages
sudo apt-get install debhelper build-essential fakeroot
Now download the libdvdcss2 library using the following command
sudo /usr/share/doc/libdvdread3/examples/install-css.sh
For Ubuntu Edgy Users use the following command
sudo /usr/share/doc/libdvdread3/install-css.sh
That’s it now Your DVD player should now play back encrypted DVDs.You can ope your Movie player from Applications > Sound & Video
Related content:

Nice. This hint ist very helpful for me.
Your blog has been added to Linux Blog Aggregator @ http://blogs.linux.org.bd
OMG thank you so much! This worked perfectly for me on Ubuntu 6.10 Edgy Eft. Thank you! Thank you!
- Cazzj
Great this worked just fine for me in ubuntu fiesty fawn. Thanks very much!
Good stuff, worked straight away no fuss. Cheers