Why is there writing on my screen?

I have downloaded a movie straight to my psp from the net and then I used AVS video maker to put each part in order to make a movie out of each that I just downloaded.Then I used AVS video converter to convert the movie to DVD. When I did all this then played my DVD in my DVD player it had this in the middle of the screen the whole time “Created with a non activated vision” with a website address under it. How do you get rid of this writing.Is the writing there so people wont copyright it? It is always there in the centre of the screen. Please tell me why it is there aswell how to watch a movie without it on the screen.