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2. Bicycle-sharing system - Wikipedia

   en.wikipedia.org/wiki/Bicycle-sharing_system

   From 1 March 2020, QR Code Lock was introduced as a method of renting and returning by recognizing QR codes. [citation needed] It is convenient because it can be rented or returned with a single scan by using a QR code-type locking device. When renting a bicycle, purchase a voucher from the bicycle app and scan the QR code on the bicycle to ...

3. Identity document - Wikipedia

   en.wikipedia.org/wiki/Identity_document

   The machine-readable code contains all printed text information about the card holder (it replaces the QR code) while both chips (the smart card chip is hidden under the golden contact pads) contain all personal information about the card holder along with a JPEG photo of the card holder, a JPEG photo with the card holder's signature, and ...

4. Wi-Fi - Wikipedia

   en.wikipedia.org/wiki/Wi-Fi

   A QR code to automate a Wi-Fi connection using WIFI:S:Wikipedia;T:WPA;P:Password1!;; A flaw in a feature added to Wi-Fi in 2007, called Wi-Fi Protected Setup (WPS), let WPA and WPA2 security be bypassed. The only remedy as of 2011 was to turn off Wi-Fi Protected Setup, [143] which is not always possible.