I'm pretty sure a bar code similar to this one gets pressed to the inner ring of the disk:
It just stores data of where the disk was pressed, but the Wii checks for that.
What about softmodding the DVD drive? Similar to an Xbox 360, so the laser looks for Nintendo's press info on the first...
Give the guy a break, you're all fricken stupid. Why wouldn't you want an ISO loader? "OMG. It's illegal!!!"
I'm sure you buy all your games to "support the developers".