I've been looking into creating video tutorials/guides to sell on ClickBank for trademarked products. I've seen others doing this already but I'm still feeling somewhat uneasy about the legality of it. The last thing I want to do is put a lot of work into a product and then have some corporate lawyer contact me telling me to take it down, or worse that they are suing me for copyright infringement. An example of what I mean is "A Video Guide To Using Microsoft Outlook" or a "Video Guide To Using PowerPoint" Looking for helpful advice