Sort of relevant is microprinting that still is in use today on money documents such as checks [1]. It would be interesting to combine the two techniques! Mic

Sort of relevant is microprinting that still is in use today on money documents such as checks [1]. It would be interesting to combine the two techniques! Microprinting is for preventing forgery and thus is incredibly difficult to copy but techniques to copy are always improving. I assume microdots are not as difficult to copy and are about tracking. So if someone effectively copied the microprint you could inject microdots and those would be copied as well. Thus you might be able to track the forger as well detect forgery statistical analysis (based on the fact microdots encode changing data such as time). [1]: https://en.wikipedia.org/wiki/Microprinting https://en.wikipedia.org/wiki/Microprinting