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...
billelevAsked:
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btanConnect With a Mentor Exec ConsultantCommented:
I will say that your UID is quite similar to watermarks for PDF and of visible type.

You may want to check out this "hiding" of watermark in images which most common is to embedded the information in the pixel of the image @ http://www.isr.umd.edu/~minwu/public_paper/Jnl/0408binwmk_IEEEfinal_TMM.pdf

On related note, I take it as stegnography as well but on digital image. @ http://www.garykessler.net/library/steganography.html
 
Barcode as mentioned is one mean and the new "2-Dimensional" bar code symbologies like PDF417, Aztec Code and Data Matrix are useful to encode several thousand bytes of data in a single bar code symbol including text or binary data. You may want to check out Adobe LiveCycle Barcoded Forms ES @ http://www.adobe.com/ap/products/livecycle/barcodedforms/indepth.html

Moreover, 2D barcode has more variation that will be useful to explore. Nonetheless, ppl may not necessarily know since there so many variation. Can check out
@ http://www.adams1.com/stack.html

One interesting encoding is ColorCode which is designed to store URLs and be read by a cell phone camera. In your case, URL is your UID

I was thinking of Mosaic Coding can be another interesting scheme but no open techniques. Probably have to self improvise e.g. each character of the UID can be an image randomly selected from a pool of image database. All images will be selected and thereafter used to create a mosaic of a base image. The latter would be first character mapped image.
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billelevAuthor Commented:
Great, thanks.  Exactly what I was looking for.
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