A plug-in for use with Adobe Acrobat. MaskIt allows you to mask areas of pages of PDF documents so that anything that would normally display or print in that area will no longer appear. It is particularly useful for removing items such as logos, dirty areas appearing in a PDF file after scanning, confidential information, or headers and footers. Additional items can be added in these masked areas later, such as annotations or text output from either Mapsoft Impress or Mapsoft Impress Pro.
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.