PDF Redaction Guide: Permanently Remove Sensitive Content
Highlighting text black is not redaction. This guide explains true PDF redaction — removing content from the file structure so it can never be recovered.
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Tags: pdf, developer-tools, security
PDF Redaction: Permanently Remove Sensitive Text and Images In 2005, a U.S. Department of Justice document submitted as evidence in a court case was discovered to contain the full names of undercover CIA officers. The names had been "redacted" by placing black rectangles over them in Microsoft Word — but the underlying text remained searchable in the PDF. This was not an isolated incident. Improper PDF redaction has exposed sensitive information in countless leaked and published documents. The problem is simple: adding a black box on top of text is not redaction. True redaction removes the content permanently from the file. What Makes "False Redaction" Dangerous When you draw a black rectangle or annotation over text in a PDF: The original text is still present in the content stream…
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