»If you have PDF documents digitally signed the only way to combine them preserving their signatures is to create a PDF Portfolio with Acrobat Pro.« Source: https://answers.acrobatusers.com/How-do-I-combine-multiple-files-to-one-PDF-... On 03/08/2017 06:37 PM, Pablo Rodriguez wrote:
Dear list,
I have a question for users with more knowledge on digitally-signed PDF documents.
Is it possible to concatenate PDF documents (each signed by a different certificate [by a different person]) into a single PDF document without invalidating any signature?
I tried to join all PDF files with pdftk, but digital signatures in the resulting file were invalid.
I guess that I’m trying something impossible, but I’ll really appreciate the confirmation from somebody with experience in digital-signed PDF documents.
Many thanks for your help,
Pablo