Adding a printed Watermark into an OpenOffice.org Document takes two steps. First you have to design your watermark in a graphics application and then add it to the document.

Open your favorite graphics tool, mine is G.I.M.P. but yours might be Windows Paint or some other tool.  Choose the text of your watermark, and use the text tool to type it out.   Then rotate the text  40 to 50 degrees so it is noticeable (like the one below).

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