Yeah Raaabo, I Personally went and ran the DVDUPGRD command, it did have the codec required.. Even VLC player/MPC couldn't play the DVD. That's why I said, it might be a coaster.
G Spot does show what codec we have installed... it's not really difficult to "read" and infer the thing.. it comes with a small description as well.
Yeah we can't expect ppl to install this, moreover many of them might not even know abt this.