Found the official sites:
http://www.geneon-ent.co.jp/rondorob...nt/comike_07w/
http://www.fwinc.co.jp/event/c73.php
Apparently it was a tie-up (Geneon distributed the Saber CD while Frontier Works distributed the Rin CD). I'm leaning towards putting both as publishers, but without scans I can't say for sure.