Markvh,
You brought up a good point, it's called the "fair use policy" - if you're using a part of a copyrighted movie to sell the movie it's not a copyright violation. So short movie clips, scans of movie posters, caps from a movie are all fair game under that.
So you need to get an affiliate program at Amazon or somewhere and each time you update the clip - link to the page to buy it. (and hey, Amazon pays 5-10% on movies)
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