PDF StartUp is an "autorun" application designed to automatically open a PDF document located on a CD-Rom when it is inserted into a computer, after having installed Acrobat Reader if needed. Isn't it a good way to tempt the target of your multimedia operations to actually read your documents?
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.