Can't be stopped. Can be made harder though. In my opinion of effectiveness against cost.
Limit downloads per day to a certain GB.
Have a good password protector on the site, so hackers get bounced.
Start the scenes with girls in your T-shirts or even a big banner at the back of the room, so every pirated video is an advert. Screw the domain in te scene, stick a dirty great big banner into the scene and shape the scene so the user knows who shot it and where to find more.
Watch the Tubes and DMCA them all day or get
www.removeyourcontent.com onto the job. They seem to have stopped taking new clients, time to start a new similar company?
Get a lawyer to send threatening letters to anyone. Expensive but the most effective. Strangely those with lawyers with balls don't seem to get onto tubes as often as others. Go figure that one out.