Watermark Program For Videos

Does anyone know of a watermark program i can use for videos? i have some movies that i have put together, but i would like to put a simple line of text at the bottom of the screen that says the url during the whole movie. windows movie maker just leaves it sitting in the center of the screen

also, i have tried right-clicking on the video file and going into the properties, but i can't change the text displayed for author, subject, etc. can someone please help me out on how to do that?

 

Ever used Zwei-Stein before?
http://www.thugsatbay.com/

I'll look up a tutorial for compositing a still image.

 

Ugh, its a bit complicated, but do some gooling and im sure you'll be able to work somthing out.