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Printers add small invisible yellow dots to pages to make them traceable. Is this a viable way to find out where these pages were printed?
by hyperman1 8y ago
Printers add small invisible yellow dots to pages to make them traceable. Is this a viable way to find out where these pages were printed?
- est31 8y agoMost of them are probably lost due to the heavy compression applied... but extracting yellow dots from scanned documents is possible in theory. E.g. it was most likely the reason why Reality Winner got arrested so quickly after she gave NSA documents to the press: https://en.wikipedia.org/wiki/Reality_Winner https://en.wikipedia.org/wiki/Reality_Winner