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Hiding confidential information with black marks works on printed copy, but not with electronic documents, the National Security Agency has warned government officials.
The 13-page paper is called: Redacting with confidence: How to safely publish sanitized reports converted from Word to PDF. pdf
Meanwhile, the NSA paper itself contains a bit of metadata. According to its cover the paper was created on Dec. 13, 2005. The properties of the Adobe PDF file, however, state the document was created on Jan. 10, 2006.
Editing tips from the NSA