CLIC2C-US is a universal barcode scanning application that will read QR codes as well as digital watermarks.

By installing CLIC2C-US, iPhone users will be able to enjoy the interactive experience whenever they encounter a printed advertisement that is coded with a mobile barcode or a digital watermark (invisible barcode). Scan the ad and immediately connect to internet content to receive product information, coupons, movie trailers, ringtones, wallpaper, public service information or business information.

http://appshopper.com/utilities/clic2c-us