Foto: "<a href="https://ccnull.de/foto/a-new-german-open-source-project-corona-warn-app-helps-in-the-fight-against-the-pandemic/1017439" target="_blank">A new german open source project - Corona-Warn-App helps in the fight against the pandemic</a>" von <a href="https://ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://ccnull.de" target="_blank">ccnull.de</a> - <a href="https://www.flickr.com/photos/30478819@N08/50060591231/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>