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Macy22869267p29g
Participant
February 17, 2022
Question

Organizing/combining PDFs after they are signed?

  • February 17, 2022
  • 1 reply
  • 357 views

Hello, we are having an issue where we need to combine multiple PDFs into a single PDF after they've been digitially signed. However, trying to organize them results in losing the signature. Is there a reason for this, and a workaround? Thank you.

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1 reply

Thom Parker
Community Expert
Thom ParkerCommunity Expert
Community Expert
February 17, 2022

A "digital certificate" signature is actually a block of encoded data that is generated from a section of the binary PDF file data.  To verify a signature this block of data is recreated and then matched to the existing block. This verifies the document has not changed since the signature was applied. 

 

You are changing the document, so of course all the signatures are now invalid.

I think you need to ask yourself, "what do you really want?"  Why are you using a digital signature at all? 

 

 

Thom Parker - Software Developer at PDFScriptingUse the Acrobat JavaScript Reference early and often
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