What Are QR Codes?

Even before millions watched a QR code bounce across the screen during the Super Bowl, the plucky code scratched back into our lives. 

Create Malicious QR Codes to Hack Phones & Other Scanners « Null

QR codes provide endless possibilities for digital customer

Will my QR Codes expire?

Actually, QR Codes Never Went Away - The New York Times

QR Codes for Online Forms

Can't Scan QR Codes with iPhone / iPad Camera? Here's a Fix

4 Lessons From the Improbable Rise of QR Codes

QR Codes: A Secret History

Why two QR Codes with the same URL can look different?

What is a QR code? What are QR codes used for? - Digital Citizen

QR Codes – Easy Digital Downloads Documentation

How to Perfect QR Code Quality

5 Things to Consider Before Scanning Your Next QR Code

How to create a QR code + best practices

How QR codes hide privacy, security risks