The disc copy protection could not be verified [-70025] macbook dvd error

Hi all,
I've a 3 month old macbook but for some reason it's unable to play any genuine, retail dvds. I just get this error message: the disc copy protection could not be verified [-70025]. Front Row just quits and VLC is unpredictable.
Ironically, backup dvds of the same films work fine. Ive tried reseting the vmc and pram, reinstalling tiger then leopard from fresh installs and getting all necessary software updates. Nothing. Could this be the dreaded firmware superdrive update?
Any advice/help would be much appreciated

there are more users with that problem:
http://discussions.apple.com/thread.jspa?messageID=6203213&#6203213
Another one. That happened to me before the Apple Store replaced my superdrive:
http://discussions.apple.com/thread.jspa?messageID=6077903&#6077903
There are not two wihout a three:
http://discussions.apple.com/thread.jspa?messageID=6320531&#6320531
But i get no answer from Apple. They replaced my Superdrive. Then, i reinstalled MacOs, and i still can't play most of my dvds.

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    there are more users with that problem:
    http://discussions.apple.com/thread.jspa?messageID=6203213&#6203213
    Another one. That happened to me before the Apple Store replaced my superdrive:
    http://discussions.apple.com/thread.jspa?messageID=6077903&#6077903
    There are not two wihout a three:
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    But i get no answer from Apple. They replaced my Superdrive. Then, i reinstalled MacOs, and i still can't play most of my dvds.

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