A contractor who leaked a top-secret document to The Intercept was identified because the NSA was able to track who had printed out the document, using the yellow dot pattern that many printers place ...

Four academics from the Technical University in Dresden, Germany (TU Dresden) have created an app that detects and masks the hidden dot patterns that laser color printers secretly hide on all printed ...

Based on their alignment, these dots can reveal the time and date when the document was printed, and the printer's serial number. This allows companies to track leaks to printers installed in certain ...