Acrobat has various in-built security features controlling access to PDF documents. Within Acrobat these features have to be set on a file-by-file basis (by selecting the File > Save As menu item). However, Mapsoft SecuritySetter allows you to set these security features once, and then apply those settings to a large number of files if used in conjunction with Mapsoft’s Automator tool. Obviously if security options are set for multiple files, all files opened in the same batch must have the same or compatible security settings.
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.