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I heard Oliver Hirschbiegel, the director of downfall, talking on the radio the other day. He finds most of the parodies amusing, and sees them as a creative compliment to his original work.
Apparently the only ones he dislikes are the ones that feature hate-speech and the like, and he disagrees with Constantin Film over the blanket ban.
I just found this article which as a few words from Oliver Hirschbiegel: http://edition.cnn.com/2010/TECH/04/22/copyright.hitler.videos/