Trading can't be stopped really... put a stamp of your url on the first and last few seconds of every clip. You might get some signups from the p2p people if they really like the video and they can't find more.
I've bought trial memberships to many sites for "research"
and I think the clips should be at least 2-5 mins. Mpeg is still the most universal format and the more savvy users will be able to join them into one big clip for their uniterrupted viewing pleasure.
or if you use .wmv make the clips 5mins or longer. To my knowledge .wmv can't be easily and quickly joined with simple software like mpeg can. (Yes a surfer could load it premiere or similar and render it...but that takes too long.)
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