Fine Picture Code

http://www.akihabaranews.com/en/news-12453-Fujitsu+creates+an+invisible+bar+code.html

The new bar code will be IN-VI-SI-BLE to the naked eye, but your cell phone will be able to detect it and get the Internet link to the product or any other information. Named FP (Fine Picture) Code, it is made of thin yellow lines that will not be visible once printed on a picture.

Like QR codes, Fine Picture codes allow you to photograph the code using your cameraphone and be redirected to a URL for the product. However, instead of a black square, the pale yellow FPcode is printed directly onto the image of the product. So you take a snap shot of the product and off you go.

http://www.w2forum.com/i/The_FP_code_better_than_the_QR_code