When adding videos, diagrams, photos, or other media to this wiki, how do you decide which photos or videos to use? Here are some guidelines to consider: Licensing - of course first and foremost, make sure that we're not violating somebody's copyright, or that we're on the correct side of Fair Use considerations. "Fair Use" generally means small excerpts, for instructional use, that doesn't detract from the copyright holder's ability to derive revenue from his or her copyright. That means don't copy other people's work wholesale, but often a small quotation or excerpt is okay.