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billelevFlag for United States of America

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How to add unique identifier to PDF as image

I want to add a unique identifier (UID) to a PDF report.  This identifier will ideally be in graphical form, and unrecognizable as a UID.

Does anyone know potential formats, websites that discuss such techniques?  

A barcode is obviously one example, but I'm looking for me creative solutions...
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btan

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Great, thanks.  Exactly what I was looking for.