Today I learned that many/most color laser printers layer an array of yellow microdots on top of documents 🔬
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 😑
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 ✊
@douginamug That is how whistleblower Reality Winner was identified and arrested.
@joachim damn. And to think I had no idea I was producing these dots myself til last week!
@krugar @joachim @douginamug @jums there's a lot of fuzziness there. For some printers there is a concrete "yes" to the #trackerdots question, and for others it's up in the air. Obviously ppl should avoid buying a printer that's confirmed compromised. Oki is a good bet. It's non-US, & Oki doesn't have scandals and dirt that most makers have.
@jums @douginamug @joachim @krugar This is where some of my info comes from: https://www.eff.org/pages/list-printers-which-do-or-do-not-display-tracking-dots