deb-src  http://ftp.de.debian.org./debian   jessie                  main contrib non-free
deb-src  http://ftp.de.debian.org./debian   jessie-updates          main contrib non-free
deb-src  http://ftp.de.debian.org./debian   jessie-proposed-updates main contrib non-free
deb-src  http://security.debian.org./       jessie/updates          main contrib non-free
deb-src  http://ftp.de.debian.org./debian   jessie-backports        main contrib non-free