As an alternative to using the AutoCAD Plot Stamp use the AcroPlot Pro watermark feature instead. 
  
  
 
  
 Click on the Options Tab to Access Watermark Settings 
Click the Options tab from the main screen to access the settings for the watermark feature 
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 Watermark Options Section 
This section controls the watermark feature to add a watermark onto each page. 
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 Watermark Font Controls 
Select the font, size, and color for the watermark text is using a text watermark. 
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 Enter Watermark Text 
Enter Text in this box if you want to use text for the watermark. 
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 Select Watermark Image Button 
Use this button to browse for an image file to use as the watermark instead of text. 
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 Watermark Text Wizard 
This button will open up the Watermark Text Wizard which will list fields (date, time, file properties) that you can use in the text string. 
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 Place Watermark Anywhere on the Plot 
Use the controls here to control horizontal and vertical placement of the watermark text or image on the PDF page. 
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