Guides and articles in Security & Permanence.
PDF metadata like author, software, and edit dates can leak private details. Here is how to remove metadata and hidden data from a PDF and confirm it is gone.
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Do not trust a black box. Here is how to verify a PDF is properly redacted using the copy, search, and metadata tests, and what proper redaction removes.
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Most PDF redaction can be undone by copying the text under the black box. Here is how it happens, how to test your own files, and how to redact so nothing comes back.
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