Color Construct Code
Color Construct Code (or Color C Code or CCC) is a bar code symbology which uses multiple colors in a square array. It was developed by Colour Code Technologies Co., Ltd., which uses the British "colour" spelling in its company name but the American "color" spelling in the name of the technology.
The bar codes use tiny colored dots which somewhat resemble those "hidden-picture" things in the Sunday comics which show a secret image if you squint and cross your eyes in just the right way. No secret images show up in the bar codes, though.
There is some embedded security so that bar codes can be made which can only be read by authorized users.