To verify that the code works, the Kraays had to commission a helicopter to fly them over their own farm, allowing them to scan it while hovering hundreds of feet above.

ENGADGET: Visualized: World's largest QR code is a Canadian maize maze

Iridian uses a 512-byte code to verify the identity of anyone seeking access to restricted areas and its technology has never allowed access to an unauthorized person, according to the company.

CNN: Comdex: With biometrics, you're the password

The FDA said the Plan B One-Step will be packaged with a product code that prompts the cashier to verify a customer's age.

NPR: FDA: Morning-After Pill OK For Ages 15 And Up

The packaging will include a product code that prompts the cashier to ask and verify the age of the customer.

CNN: SHARE THIS

They are also asked to verify the 15-digit IMEI (International Mobile Equipment Identity) code of legal devices.

BBC: Uganda delays fake mobile switch-off date until 2013

Under Mr Simons' scheme, which is being implemented in Nigeria and Ghana, a scratch-off panel on the packaging reveals a code which can be texted to a special number to verify that the drugs are genuine.

ECONOMIST: Beyond voice