U.S. military security defeated by copy and paste | CNET News.com: "According to a report by the Associated Press, a representative of Adobe Systems, owner of the PDF format, has suggested that whoever attempted to censor the report did so by placing black rectangles over the text in question, rather than deleting the text.)
The technique used would indeed have protected the data if the document were being read online or printed. However, by an attacker selecting the blacked-out text and using the copy and paste functions, he or she could easily reproduce the document in its entirety on any word-processing application."
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