DynamicPDF™ Merger for .NET makes simple the task of merging and adding new content to existing PDF documents. The object model is intuitive and easy to learn, yet very flexible allowing PDF merging, stamping, appending, form filling and page placing, rotating and scaling.
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.