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    After discovering these techniques

    I thought the article was cool but was shocked by the author’s implication that his findings were novel or even relatively unknown. It’s surprising that a self-proclaimed security expert has not heard of digital watermarking, or researched prior work. Searching for “digital watermarking zero width” yields many results, and I remember reading about using synonyms in an article from he 90s.

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      Be sure to read his followup for why sharing leaked documents at all can harm the source’s safety.

      OTOH, if you don’t share the documents, few will believe you.