/etc/default/kdm.d/20_debian-edu is in debian-edu-artwork 0.52-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | USETHEME="true"
case "$(readlink /usr/share/kde4/apps/plasma-desktop/init/20-desktop-base-edu.js)" in
# Debian Edu Spacefun (squeeze)
"/usr/share/debian-edu-artwork-spacefun/kde4/apps/plasma-desktop/init/20-desktop-base-edu.js")
THEME="/usr/share/kde4/apps/kdm/themes/debian-edu-spacefun"
;;
# Debian Edu Joy (wheezy)
"/usr/share/debian-edu-artwork-joy/kde4/apps/plasma-desktop/init/20-desktop-base-edu.js")
THEME="/usr/share/kde4/apps/kdm/themes/debian-edu-joy"
;;
# Debian Edu Lines (jessie)
"/usr/share/debian-edu-artwork-lines/kde4/apps/plasma-desktop/init/20-desktop-base-edu.js")
THEME="/usr/share/kde4/apps/kdm/themes/debian-edu-lines"
;;
esac
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