Hi Peva,
Well, a classic watermark was a barely visible 'signature' in the paper itself, meant to be non-intrusive. A (rubber) 'stamp' is
basically what would be something you overstrike/overlay with, although Microsoft is choosing to put background stamps in their
'printed watermark' by Powerplus feature. There is significance to the 'printed' term there, in that if you open a Word document
with a watermark and use File=>Web Page Preview, you can get a browser rendition of the document, but without the watermark. You
can, however, use the Background feature to have it appear in Webpage previews as well, but still, you can access the individual
pictures with no markings.
If you want the pictures marked, you may want to look at a graphics package that can batch process adding annotations/rubber stamps
to pictures (similar to how a digital camera embeds the date onto the picture) or 'picture watermarks' or send to PDF or other
format where the mark and picture are combined.
A problem with an 'on top' rubber-stamp watermark can be that what's under it becomes unreadable.
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Suzanne - Any way to get a watermark to show up on a photo (i.e., they show
up over text, but whenever they are where photos are, the photo hides them)?
Photos hiding watermarks defeats the purpose of watermarks. >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
Pricing and Packages for '2007 Microsoft Office System'
http://microsoft.com/office/preview