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Acrobat 9 Pro - Add watermark to digitally signed pdf?

Is there a way to add a watermark to a digitally signed pdf using Acrobat 9 Pro? I was able to do this using Acrobat 8, but Acrobat 9 restricts this change.
Invalidating the signatures is not an issue as the watermarked copies would be considered uncontrolled.
Thank you.
A - if you add XMP-based metadata (which has bene the preferred method of metadata since PDF 1.4) in "append mode", that will not invalidate any signatures on the document.
B - Yes.
Read the other 2 answers
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