"According to German IT news site heise.de, yesterday several 3D showings of Avatar couldn't take place, because the movies were DRM protected such that there had to be a key per copy of the film, per film projector, and per movie server in the theater. The key supplier, by the name Deluxe, was apparently unable to provide a sufficient number of valid keys in time. Moviegoers were offered to get a refund or view an analogue 2D showing instead."
http://entertainment.slashdot.org/story/09/12/17/1916241/DRM-Flub-Prevented-3D-Showings-of-Avatar-In-Germany?art_pos=22
http://entertainment.slashdot.org/story/09/12/17/1916241/DRM-Flub-Prevented-3D-Showings-of-Avatar-In-Germany?art_pos=22