Now... about QR codes... It's a completely silly concept (qualified below). There's no way that anyone is going to be running around town and see some QR code and think to themselves, "Hey! I need to go and find out what that bizarre looking squiggly square is, then look for software than can decrypt it for me so that I can try and find some web site..." JFC... That's total insanity. QR can only work if it is pre-installed on all (or most) devices. Nobody cares about funky squares. They're meaningless wastes of space for most people. That is... Until it reaches past critical penetration, which it is very far from right now. (Yeah... I tend to piss on stuff early... I know...) But we've already seen this fail several times before. The QR code thing is just the new kid on the block, and he'll get his black eyes as well before long. (Unless there is serious industry intervention.)
That is, adding in an additional layer before people can get to the data is simply too much to ask. (Yes - I know what I just said, and the implications, but the installable software question is an entirely different level of commitment on the part of the recipient.)
It's a bit OT, but I had to arrest you regarding the QR codes.
They're not exactly new, invented in Japan in 1994 by Toyota subsidiary Denso Wave to track vehicles during manufacturing,
registered with AIM since 1997, ISO (something) since 2000, and readers exists for just about anything
symbian, android, iphone, pc, in addition to specialized readers etc.
Nowadays it's either included or freely available to just about anything portable which has a camera.
Basically, I think QR codes is almost as well known as barcodes now, just that the man in the street can actually use the former, and QR codes can provide alot more information.