When reporters at The Intercept approached the National Security Agency on June 1 to confirm a document that had been anonymously leaked to the publication in May, they handed over a copy of the document to the NSA to verify its authenticity. When they did so, the Intercept team inadvertently exposed its source because the copy showed fold marks that indicated it had been printed – and it included encoded watermarking that revealed exactly when it had been printed and on what printer.
https://arstechnica.com/security/2017/06/how-a-few-yellow-dots-burned-the-intercepts-nsa-leaker/
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