PROscript is a conversion and quality assurance program for PostScript files. Among it's key features is that it can rewrite PS files. The resulting file is static and clean and works on all setters and printers. When writing the new file, PROscript can be set up to convert colors, compress and downsample images, embed fonts and more.
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.