https://www.digisigner.com/downloads/DigiSigner-4.0-Win-Install.exe
https://www.digisigner.com/downloads/DigiSigner-4.0-Mac-Install.zip
https://www.digisigner.com/downloads/DigiSigner-4.0-Install.zip
https://www.digisigner.de/wp-content/uploads/2018/11/Rechtslage-zu-DigiSigner-Signaturen.pdf