I usually use VLC without a problem. Some distros won't include something like libdvdcss, and you have to download, compile, and install it. It's annoying, but

I usually use VLC without a problem. Some distros won't include something like libdvdcss, and you have to download, compile, and install it. It's annoying, but better than when DVD support first appeared, and you'd end up compiling something like 5 libraries and a custom version of Xine.