Impress Pro is an Acrobat plug-in that enables one or more text impressions (text stamps) to be added to a range of pages in single or multiple PDF files. Impress Pro contains all of the features of Mapsoft Impress (see below), with the addition of being able to run over batches of PDF files and the ability to set multiple impressions at the same time.
In addition, security, open defaults and document information can all be set.
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.