how to play encrypted dvd in ubuntu 10.04

After installing the Ubuntu 10.04,some extra softwares i.e is not installed by default(Due to license problem) is necessary to install.. like adobe flash player, and library for playing encrypted dvd. In general all the commercial DVDs use CSS(Content Scramble System),a digital right management(DRM) scheme which uses a proprietary 40 bit stream cypher algorithm.The CSS key …