I recently bouth Lord of the Rings on DVD, and my mac won't recognise it (says it's unreadable). I seem to remember a key combo that bypassed this or something, but I can't remember it. The DVD is fine, worked on my friends player, and the special feature disc works as well.
G4/400
OS Z-1 9.1
Player Z-12.7
(Z-1 is the Australia version)