The file "wallpaper.png" is licensed unded CC BY-SA 4.0 and is authored by Samuel Dionne-Riel (https://github.com/samueldr). Legalcode of the license can be found at https://creativecommons.org/licenses/by-sa/4.0/legalcode.txt The source of the file is https://raw.githubusercontent.com/NixOS/nixos-artwork/master/wallpapers/nix-wallpaper-nineish-dark-gray.png