Watermark for videos

There is 2 other websites that have the same topic as mine and  my two opponents keep taking movies from my website and put their watermark on my movies and then uppload them to youtube with link to their site..

Is it a way to get movies on my dolphin site have  a watermark automaticly when people uppload them to my site?

bump

I dont think this is possible

Hope somebody will popup with a mod for this

Watermark for video doesn't exist now! Maybe will in 7.1