I would like to reply to myself: They all are "trusted" by the DNF which is the German Research Network. https://www.dfn.de/en/ https://www.dfn.de/en/ "Scien

I would like to reply to myself: They all are "trusted" by the DNF which is the German Research Network. https://www.dfn.de/en/ https://www.dfn.de/en/ "Science itself organized the German National Research and Education Network, DFN, the communications network for science and research in Germany. It connects universities and research institutions with one another and has become an integral part of the European and worldwide community of research and education networks."