I'm trying to figure out what actually happened, technically:<p>> Some officials use a software programme such as Photoshop to paste a black patch over secret text, obscuring it but not removing it. When documents are edited in this way, normal home or office software can disclose the obscured text<p>They probably mean Adobe Acrobat, to modify pdf documents.<p>> The names of officials and outside experts involved had simply been blacked out with a marker pen, and could be read by printing the document and holding the paper up to the light.<p>Not sure, here - a /software/ "marking pen" that obscured the text, but the underlying text, presumably in a different shade, would be printed by a printer?<p>Interesting.