There are lots of firmware/software hacks to defeat these kinds of things: https://www.pelock.com/services/reverse-engineering/how-to-open-money-banknote-image-

There are lots of firmware/software hacks to defeat these kinds of things: https://www.pelock.com/services/reverse-engineering/how-to-open-money-banknote-image-in-photoshop-bypass-eurion-constellation https://www.pelock.com/services/reverse-engineering/how-to-o... There may be a mild deterrence to casual users, but if the photons are reaching a human’s eyes, there are ways to capture them.