[XeTeX] Help in Tex and PDF Positions

[Francisco Chaves]

Hi all

I want to visual digital sign PDF file produced by XeLaTeX, in order to add
the signature to the PDF I need the position of a TeX box in the PDF or add
a PDF signature field.

Is there any way of print the position of a box in the log or any other file
or I can add a signature PDF field with a LaTeX command?

Thanks in advance,

Francisco
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