Hidden information in pdf file

Hello everybody,
I've recently started using BI-Publisher and therefore I'm not very familiar with this tool.
I am using an XML file (as data source) and an rtf template to create a pdf file (I can't use a pdf template)
l'd like to know if there's any solution for the following problem :
I need to pass along some "hidden" information in my pdf file
(hidden like in metadata or anything similar : the data should not be visible on the printed document but present within the file).
The "hidden information" is a field of my XML file.
Anyhow, this hidden information must be available/accessible for those manipulating the pdf file.
Do you have any advice how to solve the problem ?
Thank you very much in advance for your help.

Publisher does not currently support embedding meta data into the output PDF. You could embed some delimited 'white' text e.g XXXX>This is the text<XXXX in the output thou. As long as your 3rd party can read the text you would be good to go
Tim

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This seems like a simple question. However, the answers are invariably complex, do not yield the desired result, and often answer a different question entirely. I say all that just to warn people up front that the "problem" is easier than how many people and PDF application developers, including Adobe, typically understand it while the proposed "solutions" are invariably a total...well, botch is a reasonable word if a bit understated.
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My "claim"? Actually I've made no "claim" such as you've mentioned.
Simply stated your OP has foundational premises that presume as factual what is not.
Here, we're in Adobe's hosted user forum for Acrobat.
Any other application use is not material.
Acrobat XI provides 3 OCR methods.
Searchable Image, Searchable Image (Exact) & ClearScan.
Only the first two provide the "hidden" text output.
(Glyphs have no stroke, no fill)
From back to the Acrobat 3 product family the design functionality of Searchable Image and Searchable Image (Exact) has been to facilitate the use of Find / Search.
The "hidden" text is can be touched up. Acrobat Pro provides the facility to view the hidden text.
So you can see what the OCR output that correlates to the bit-map images of the characters that are present.
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You'd select some of the hidden text and retype what you suspect is the correct string of characters.
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If you got it right, good. Continue.
If not, darn - try again.
Plug 'n chug -- somewhere over the rainbow it'll be done eh.
Full disclosure -- this is something I've done (enquiring minds don't you know).
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