With vaccine passports on the horizon, the government is talking about issuing QR codes to facilitate a “quick response” to get into places like restaurants and other public establishments. To some, this represents a resurgence for the trusty QR code - but is this comeback really a comeback? Or has this technology been used in multiple ways over the years? Is North America just behind the rest of the world? Are there any security concerns involved? What's changed since the QR techn...