Incomplete PDF Redaction Leaks Data From UK MoD

An anonymous reader writes "The UK Ministry of Defence has been left with egg on its face, after a supposedly redacted PDF detailing secrets related to air defence radar systems was published on a parliamentary website. The problem? Whoever did the redacting simply changed the sensitive text to black on a black background, making it possible for anyone to access the information simply by cutting-and-pasting. The incident is particularly embarrassing for the Ministry, as six months ago precisely the same security screw-up occurred — that time related to sensitive information about nuclear submarines."