Just a side note/addendum, I worked with entertainment lawyers A LOT in the early days of the web on copyrighted images and while they start from a rigorous position what one simply has to do is find out what the guidelines are that alleviate any issues. For example, with an image or a video clip it often only requires explicit attribution (so every image at the bottom must carry the legal/copyright line, and likewise with a video clip) to satisfy the lawyers. They almost never tell you that, though. That's a tip for YouTubers who get copystruck for movie clips. Run the copyright/legal line at the bottom of every clip while they are on screen and you are covered 99% of the time. That's why when you watch the news and they show a clip you see the line at the bottom of the clip. They know what the legal requirements are.