I think the primary problem with QR codes is the whole dance you have to do to read them. I have to notice the QR code. Pull out my phone. Wake it up. Load the

I think the primary problem with QR codes is the whole dance you have to do to read them. I have to notice the QR code. Pull out my phone. Wake it up. Load the QR app. Point it at the QR code. Really you want to have QR codes automatically read by looking at then and stored in some sort of buffer until you give a crap or they expire.