There is a topic section for such questions. Please post in right area.
http://final4ever.com/vbulletin/forumdisplay.php?f=91
Removing Backgrounds
Acrobat is designed to protect the integrity of your document, and once the file is saved with the background, you can?t remove it. If you aren?t sure about the background, or want to use the document both with and without a background or watermark, save the file with another name.
There is a tricky workaround for the permanent background. Follow these steps:
∙ Open a blank document in Word or some other program and save it as a PDF.
∙ Open the PDF file in Acrobat with the undesired background.
∙ Choose Document > Watermark & Background to open the dialog.
∙ Click Browse, locate the blank PDF document, and select it.
∙ Click OK to close the dialog. The blank page replaces the background.