The life cycle diagrams are provided by InfrastrukturHelden.de (Fabian Niesen) under CC-BY-ND 4.0. They may be used without editing in commercial documents and presentations provided that "InfrastrukturHelden.de (Fabian Niesen)" is credited. The current versions can be found in the GitHub repository "InfrastrukturHelden-LifeCycle diagrams".