Today I learned that many/most color laser printers layer an array of yellow microdots on top of documents ๐ฌ
This Machine Identification Code https://en.wikipedia.org/wiki/Machine_Identification_Code encodes a print date and a serial number unique to the machine. It only became public knowledge in 2004, ~20 year after deployment ๐
The Technical University of Dresden released a tool 2 years ago to layer on _even more dots_ to render the MIC unreadable and aid whistleblowers publishing https://github.com/dfd-tud/deda โ
vintage 1982 fulfilling several roles in life (not in order): father, husband, writer, worker, computer dude, science fanboy (even if I don't like the implications/conclusions), Sci-fi and fantasy inclined in both consumer and creator roles, Austrian and overall crazy person.