The issue is whether footage taken of a video game is even copyrightable by a player. If they had made an actual movie out of it, then I think you would cross that line, but a straight stream is very debatable.
As a classic example, if you pile bricks at the end of your driveway that isn't copyrightable, but if you do it in an art gallery, it becomes an artistic work.
Posted on Thursday, 9th February 2012