I figured this out a long time ago
, and even demonstrated it to my parents with Photoshop. I couldn't decide if it was so trivial that it was obvious, or if it was worth telling people about--but I was so jaded at the timeI didn't feel particularly secure advertising my (purely demonstrative and very short-lived) Photoshop escapade. But now that Slate's pointed out that the Emperoror's nekkid--yeah, it's a very silly system. I mean, we have bar code readers at my neighborhood grocery store. I'm not sure why major airports can't have them at the security lineup.