Blogger Easily Views Confidential Portions of Pentagon Report
The Pentagon, which issued the document in PDF, had hidden much of the confidential content by blacking it out. However, by simply copying and pasting the blacked-out text into a word processor, the confidential text was revealed. Check it out for yourself at vowe dot net.
There is a lesson here, as PDF for Lawyers, points out: "If you are going to redact documents, get a clue. There are a couple of things to remember here -- don't blow off understanding the structure of PDF because it's "technical;" and learn how to use your tools."