Here is an interesting example of how a modern software program like Adobe PhotoShop has built in a crime prevention feature that helps to stop the counterfeiting of money. Adobe uses a currency-detection algorithm to prevent the use of their Photoshop graphical editing software for printing of currency images with a popup window that alerts the user “This application does not support the printing of banknote images”.

You can read more on this subject and view some example images @ Faking It.