I know I'm not meant to submit my own work, but can I sumbit something that was uploaded by me to youtube but is really someone elses work?

What I'm thinking of submitting is either
http://www.youtube.com/watch?v=afIzIAwuAmk
or
http://www.youtube.com/watch?v=HxrZY6UfdPY

Both were done by other people, but I uploaded it (with their permission for the second one, and the first one wasn't around to give me permission, damn cheater). I would do it for this:
http://www.youtube.com/watch?v=oQ9iEDMLZpw
but it's already been done (that's how I found this site

Thanks