socialsketch
I like to have fun while I'm having fun
If you are using someone elses video and they don't like you using it then you have to take it down. You don't OWN it they do.
But you are adding something significant to it. Most nonfiction books on the market I've read recently are just this, taking other people's studies and experiments and adding on to them. It's a good way for our society to further develop.