LECTURE DVD PAS ASSEZ CODECS

HELLO :)
Quuuand je tente de lire un certain CD, cela m'affiche :

LibDVDCSS (http://www.videolan.org/developers/libdvdcss.html is about to be installed, it allows you to watch encrypted DVD videos. This is illegal in some countries which require decryption to be authorised by the copyright holder. Do you want to install this package?

And, when I click on yes, I fall on

http://kubuntu.org/packages/libdvdcss-i386.deb
it write me "object not found..."

Help ! My life is between yours hands :)