Op 11/06/2013 16:02, Kostas schreef:
Hello there.
Suppose that we use this PDF merging code on two PDFs that both
contain empty signature fields:
http://itextpdf.com/examples/iia.php?id=123
When they get merged, every signature field will be for signing the
page(s) that used to belong to the initial PDF (not the merged one),
right?
Also, does the merging change something in the way we set a TextField?
Feel free not to answer if you think you have better things to do.
Signature fields are fields, and as explained in chapter 6 (*) you
shouldn't use PdfCopy for documents with fields.
Instead, you should use PdfCopyFields:
http://itextpdf.com/examples/iia.php?id=126
Furthermore, as explained in the book about digital signatures (**), a
digital signature in a PDF (regardless whether or not the PDF initially
consisted of two different documents) always covers the complete
document. The concept where one signature covers pages A to B, and
another signature covers pages X to Z, doesn't exist in PDF.
In short: what you're saying is not "right"; you're trying to introduce
a concept that doesn't exist in PDF. You'll understand why it doesn't
exist once you start reading and understanding ISO-32000-1 (***).
(*) http://www.manning.com/lowagie2/samplechapter6.pdf
(**) http://itextpdf.com/book/digitalsignatures
(***) http://www.adobe.com/devnet/acrobat/pdfs/PDF32000_2008.pdf
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