How to create PDF Portfolio via API?

[Petevaluenet]

Hello Community,

I want to create a PDF Portfolio via an API request to combine different PDF files without changing there own file integrity.

The main goal is to combine a file with a digitial signature and file protection with a standard file without protection.

If I use the Application Adobe Acrobat it works how it should - I have one PDF as result including both files.

My approach is to use the CombinePDF API Request, but for some reason the result is, that the process is stopped on Adobe side because of the signed file.

How to do?

Thanks for Help!

Peter