So how do you work out what is subject to copyright and what isn't? ContentID makes a stab at it, but that's only where data has already been provided to them, it still isn't all that good either. It has no concept of, "Well actually you do have a right to use it because you've got a license/it's fair use in this instance" etc. It is the best at what it does, but it's still very poor at what it does, a very blunt tool.