Not the same thing, but it is what this app seems to do, hence why I asked what its purpose is (no offence to the creator, I'm probably misunderstanding something).

As I see it, the N900 natively plays DVD files that are transferred to it, through KMPlayer, mplayer, default media player or mediabox.

If you want to play actual DVDs, you want USB hostmode, not this. Although that baffles me too, because i can't quite work out where i'd be that i'd have a DVD player but no TV