Need Help Please

Hi All

I hope someone can help me.

I know how to rename files etc, but I have some video files that have a website URL as their copyright info (even though they actually do not own the copyrights!) and also their email address in the media player, right click file, properties then content.

Does anyone know how I can remove these? It is all legal as the video files in question are not copyrighted, but the websites I downloaded them from have just put on their website name for advertising purposes.

I would appreciate any help on this matter