Could not read dvd despite having restricted extras on Ubuntu 11.10

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http://askubuntu.com – I still can't seem to play movie DVDs on my Ubuntu 11.10 even after installing restricted extras and after trying this This[a] is the error message that I get with movie player. VLC doesn't play the DVD either. What gives [a]Could not read DVD. This may be because the DVD is encrypted and a DVD decryption library is not installed. (HowTos)