Cannot open container of blank DVDs!?

I was just about to begin a dubbing process from video to a blank DVD, never done this before but the manual indicates it's fairly easy. However...I can't get the container of blank disks open! I've tried everything short of a stick of dynamite. But I don't want to damage the disks inside. Tried sliding the inner notches back and forth, expected the case to open just like a pkg. of blank CD's. It seems to be impossible! The brand name is Maxell, by the way...

Anyone have some ideas??