Hello, I received PDFs files from many people, the PDFs files are scanned. My clients fill the PDF on their computer and they print the document to sign. They scan the document and send me by email. The problem is, when I ask them to modify some information from their forms, in some cases my clients edit the same document digitally so the signature is exactly in the same position so the information they are filling if fake instead of make the all process again. I want to know if the PDF document after scanned were modified by any software.
Is there any version/function/add-in in Adobe Acrobat or third parties software I can use to detect if the structure of the PDF were modified by someone after the scanning?
Only if it is signed. That's what signing is for - detecting change.
(By signed, I mean digital signatures. Scanned "scribbles" are worthless on a computer).