I'm not sure if this is the "open letter" referred to, but it's what Larson sent to at least a couple of people with cease & desist orders. https://www.comicmix

I'm not sure if this is the "open letter" referred to, but it's what Larson sent to at least a couple of people with cease & desist orders. https://www.comicmix.com/2008/03/07/gary-larson-and-our-far-side-cease-and-desist/ https://www.comicmix.com/2008/03/07/gary-larson-and-our-far-...