According to a post on Boing Boing, Steve Aftergood of the Federation of American Scientists (FAS) has posted the US National Security Agency's guide to sanitizing Word and PDF documents.
With high-profile PDF censorship gaffes in the last few years due to misunderstandings about the technology, this PDF guide produced by the NSA cites common information leakages and includes a step-by-step guide on the censorship of Word documents and the subsequent conversion to PDF.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.