As for how unintended secret leakage happens, the big culprit is ‘tracked changes’. This is a feature in Microsoft Word that allows people to make and track changes to a document. Anyone who has worked in a large company or government department will know that it’s a popular way for a group of people to collaborate on something while it is being developed. The problem is that tracked changes have to be enabled in a document in order to see them. Turn off tracked changes, and they disappear, but are still contained in the document.
Happily, Convert word to PDF is an easy way around this problem. MS word to PDF conversion will automatically erase old text
