in order to protect its own PDF, is sometimes necessary to increase the watermark, encryption, prohibit the printing, copying, such as the prohibition of additional restrictions to the PDF, this article on how to increase the watermark to the PDF document for details. Provided that the installation of the Adobe Acrobat software installed can not take this column with other software, other ways of increasing the watermark. The installation of Adobe Acrobat 9, see this article: PDF production of Adobe Acrobat 9 Pro Lite serial number free Starter Edition Simplified Chinese

1, with Adobe Acrobat 9 open you want to increase the watermark PDF file, select "Document" - "Watermark" - "add", as Figure :

2, the next will be the attribute set to add a watermark, you can set up to increase text, set to increase picture, you can set which pages to increase the watermark and so on, the following chart:

3, after all set up to determine, this watermark has been added to your success, and then saved from the PDF.