The Red Box DVD Vending machines use their own special case for the DVD. It has a cutout in the center of one side so you can see the center of the disk where they have printed their own special "bar code", presumably so their machine can recognize the disk. The DVDXpress machine uses a regular DVD case that you see in the store. The one disk box we got from them looked like someone had to tried to open it with a crow bar. It was a little mangled, but it worked okay.
It's not really a bar code, it's a rectangular block of apparently random black and white dots. I've seen them on some other kinds of documents, but usually they are much larger, like an inch square. These are only about a quarter inch square. You can see them in the picture arranged around the center of the disk. They are the four black and white rectangles.
Update February 2017 replaced missing picture.
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