Valentina di Liscia writes: “In 2013, photographer Kyle Cassidy uploaded one of his images to Wikimedia Commons. Anyone can use it free of charge, even modify it, under the Creative Commons Attribution 3.0 License—so long as they credit him properly. Nearly seven years later, the photo was at the center of a bizarre scam involving affiliate links, a fake copyright enforcement company, and a Wikipedia user improbably named ‘Aldwin Sturdivant.’”