We read with interest about yet another PDF redaction snafu . In this case it was the attorney of TJX / 7-11 hacker Albert Gonzales, who posted an indictment that was redacted digitally and posted online as a PDF file — making it trivial to recover the original unredacted text. Last week the US Travel Security Authority (TSA) sacked 5 persons for posting a digitally “redacted” security guideline document online.

Excerpt from:
How Not To Redact Confidential Information