Last night my wife and I slipped a DVD into our Ubuntu multi media computer and watch a good movie.

This morning I ran updates (apt-get update and apt-get upgrade).

Later when my Grandson tried to play a movie he picked up at the library, it wouldn't play. The error message read:

"An error occurred. Could not read DVD. This may be because the DVD is encrypted and a DVD decryption library is not installed."

The multi media system is running Ubuntu 12.04. Had the same issue with my wife's computer which runs Ubuntu 11.01.

Did a quick search on the internet and found that other experienced the same issue, and the fix was simple.

Word Of Caution - Do to copyright laws, this program may not be legal in your country

1. Go into terminal mode
     ctl Alt t

2. Install a package named libdrdread4
    sudo apt-get install libdvdread4

3. Run the following script:
    sudo /usr/share/doc/libdvdread4/install-css.sh

After a reboot the dvd played just fine