The QR code has the first letters of your fist and last name, as well as date of birth (without the year). Let's say your name is Gerrit de Winter, born May 3

The QR code has the first letters of your fist and last name, as well as date of birth (without the year). Let's say your name is Gerrit de Winter, born May 3 1973. The QR code would then contain: G W 5/3 Nothing is stopping you from sharing the code with your friends as long as they share these limited credentials, but those chances are very small. It's easier to get a valid QR code than finding a credential twin.