I plan on developing a blog about a sport, lets say snowboarding. Blog will be posting a lot of Videos, new tricks, broken records ... So we will register a youtube channel. Are we allowed to use other peoples videos, and brand them with our intro/outro, like snowboarding-blogTV crash bum bang ... video goes ... snowboarding-blogTV crash bum bang. blog/Domain will be held by a legal company in legal country. Can I be sued for this? Do I need to put a disclaimer that video is not ours? What about if I put music in video, can I do that?