Comment 5 for bug 1315873

Theoretically, according to this guide: https://help.ubuntu.com/community/RestrictedFormats/PlayingDVDs it's also necessary to run the following command:

    sudo /usr/share/doc/libdvdread4/install-css.sh

I did that, but I still can't play dvds. I also get the same error about "Add. Sense: Read of scrambled sector without authentication" which seems to indicate that it's not possible to decode the copy protection mechanism, even though libdvdcss is installed.