Sometimes, a great photo has something you’d rather not share—like a license plate, address, or even a stranger’s face.

QR codes seem pretty innocuous until you scan a bad one and get something nasty on your system. If you want to keep your phone and your data safe, there are a few ways you can identify a fake QR code.

The website restofworld got entries from 45 countries for a photo contest focusing on technology. Here are their top picks -- ...