From similar discussions on the Merc forums when I had my SLK, coding the screen to show DVDs, etc while the car is in motion WILL invalidate any insurance, and I doubt that an insurer will still cover without a massive hike in premium if you inform them it's been done.
One thing assessors check for in the event of an accident is if anything had been altered which may have resulted in a driver distraction - having a DVD playing while driving certainly counts, and they will not be likely to accept the argument that it was only for the passenger's use.
Use at your own risk!
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