How Color Tracking of laser printers works
Imagine a world when every time you print a document, it automatically include a secret code that could be used to identify the printer and potentially, the person who used it.
Sometimes, this happen. It’s an old news that some laser printers use a machine code identification technology, how this works?
Some printers print a watermark on every page with information, like model and serial number, that can be used for machine (and people) identification.
With a simple scanner and some UV leds we can read the dot code.
There is a scheme for decoding, EFF breaks the code here: DocuColor Tracking Dot Decoding Guide.
Links:
- Investigating Machine Identification Code Technology in Color Laser Printers
- List of Printers Which Do or Do Not Display Tracking Dots
- FBI Is Keeping Documents on ACLU and Other Peaceful Groups
- Government Uses Color Laser Printer Technology to Track Documents
- Secret Service can track what you print
- Modifying the S400 Scanner for Watermark Enhancement
- Secret Forensic Codes in Color Laser Printers
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