Following Winner's arrest and subsequent charging, the security researcher has submitted a pull request to the PDF Redact Tools, a project for securely redacting and stripping metadata from documents before publishing.
[...] "The black and white conversion will convert colors like the faded yellow dots to white," Szathmari told Bleeping Computer in an interview.
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(Score: 2) by KilroySmith on Saturday June 10 2017, @08:41PM
Often the letterhead, headers, and footers help to authenticate that the document is "real", even though they're easily faked.