I have two SECURED PDF with Document Security. One is SECURED PDF without signature and another one is the same SECURED PDF but have been signed.
Below are Document Security details for both of them:
SECURED PDF - no signature
SECURED PDF - already signed
My problem is I cannot Merge signed SECURED PDF into another PDF. In the other hand, I can Merge or Combine SECURED PDF without signature in there.
Document Security for Document Assembly that allowing Merge/Combine for both document is already True (Allowed).
Why I cannot Merge it? Is there any method I can use? Is there anything wrong with my Document Security details?
PDF Portfolio cannot be used in this case because we're not going to share the password. It will kill the purpose of having the PDF Secured.
You cannot merge/combine sighed PDFs because such operation would invalidate the signature. Digital signatures apply to a PDF as a whole and if it became a part of other PDF the signature would be broken (invalid).