

Not really. They’re just barcodes on steroids. Originally created for industrial machinery. They have absolutely no built-in security, and can’t be read by a normal person without a machine helping out (which is a problem if the machine just dumps it straight into a browser’s location bar).
An ideal system would be human- as well as machine-readable, and incorporate some kind of verifiable issuer’s mark. But as usual, no one invented one in time, and so we’re stuck with a system a Japanese factory developed so that their machines could figure out which car part they were looking at.
Oooh, then we could refuse him entry and leave him in limbo.