dvds not able to play in VLC nor Movie Player, 12.04

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http://askubuntu.com – im trying to play a movie on my ubuntu machine using VLC or Movie Player. the source of the movie is a dvd. both players say the same thing. they say the dvd cant be opened because the dvd is encrypted... i checked for updates but there wasnt any soooo. Any ideas? Thanks Alex my sisters ubuntu machine does the same thing with a different movie. (HowTos)