Watermarking documents is becoming an important part of business these days, and Adobe Acrobat
Stamp Tool is one of the tools that let you add watermark in your PDF documents. With this tool, you can easily and freely add watermark information to any of your PDF files as different kinds of objects, such as your own texts, commentaries, notes, numbers, codes, dates, times and many other things. You can also use the software to protect your PDF files, or to authenticate them. Adobe Acrobat Stamp Tool
works on Windows 95, 98, 2000, ME, NT, XP, 2003 and Windows Vista.