Relying on external content can be no fun at all. Especially dealing with broken link, deleted media etc. If it’s mine or belong to me, that wouldn’t be a problem. YouTube videos, flickr photos — now who doesn’t link or embed to that.
So I guess that’s why we see a lot of duplicate video in YouTube. Probably just in case.
Awesome information you got here. I’ve been reading a lot about this and I am thankful for this article. It was indeed a great help