Preserve digital signature validity when merging signed PDFs into a single flattened package
When submitting to authorities one of the requirements is to hand in a flattened PDF with months/years of work combined. This needs to be executed by merging the existing signed off PDF files to one file without losing the integrity of any of the signatures or properties. What would be needed for this to be possible is to be able to keep the "lock" on all documents and combine so no changes will be made in the documents without other parties knowing about it. Unfortunately making a portfolio or only signing off after the merge is not sufficient and doesn't meet the requirements of the authorities for it to be ready for submitting. With this feature request we would want something to make this happen without altering the single documents after signing or compromising on the legal validity.
Mirthe Visser
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