When combined with a web server that supports byteserving, optimized PDFs display the first page without waiting for the entire PDF to transfer to the user's browser. This can save considerable time over a slow link when displaying PDFs. In addition, all of the features of PDF Secure are included with PDF Secured Optimizer. This allows you to apply 40 or 128-bit encryption, password protection and disable certain features.
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.