QR Codes are used in conjunction with Permit Zones and will link to the website detailing exclusion zones.
A QR Code looks like this:
To scan a QR Code will require a QR Scanner which is an app for smart phones and tablets. A QR Scanner can be downloaded from your app store (iTunes Store, Google Play, etc...).
Once the QR Code is read by the QR Scanner it will open the associated Permit Zone page (See below).