deb-src $mirror $codename main upstream import backport $optionalcomponents

deb-src $basemirror/ $basecodename main contrib non-free
deb-src $basemirror/ $basecodename-updates main contrib non-free
deb-src http://security.debian.org/ $basecodename/updates main contrib non-free

deb-src http://www.deb-multimedia.org $basecodename main non-free