This is silly. Reading through the complete licensing terms... even to this non-lawyer, the author(s) don't seem to understand licensing. So there's the Coron

This is silly. Reading through the complete licensing terms... even to this non-lawyer, the author(s) don't seem to understand licensing. So there's the CoronaVirus License, thingy.... A little further down the page... "PlantUML is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. " OK... so that's contradictory.... there's no "or" in picking a license and terms of one license are, in principal and spirit, antagonistic to the terms of the other. And then there's a very confusing bit about image ownership... That wipes this UML tool off my candidate tools list.