Parody, by itself, is not enough to be considered "fair use". Further, in the case of these clips, parody may not apply.
Copyright law prohibits the substantial use of a copyrighted work without permission of the copyright owner. In the case of these clips a substantial portion of the work "Downfall" was taken. This scene is a likely the most memorable part of the movie, not just a short snippet.
These clips do not meet the definition of parody (a literary or musical work in which the style of an author or work is closely imitated for comic effect or in ridicule). The edited clips do not ridicule the movie, actors, producers, or anyone else involved in the original work. It pokes fun of other subjects, Ipad, Prosper, Xbox Live, etc. These edited clips are the unauthorized use of the owner's intellectual property to promote the interests of the editor.
One might argue that it is a parody of Hitler's personality becoming upset over a trivial matter. I think that would hold water if it was done with an actual clip of a Hitler speech.
Now, should Constantin Films be getting their panties in a wad over this issue? Hell no. They should be spinning this into selling more copies of the DVDs. That might be their intent. There is no such thing as bad publicity as long as you spell my name right.
