PDF/A - shrinking and checking for e-Signature

[ramiro_5353]

Hi team, I've almost got it, hopefully you can help.

I have a billion PDF/A PDFs.  Some have e-signature (docusign).  I don't know if they have a full digital certificate or just 'the signing'.

I need to shrink these if possible.

1)  If I use Preflight, and check "Check if Digitially Signed"

   - Will this always be true if the PDF is PDF/A 2-b format anyway?

   - It marks them as "success" for all my PDFS  even when there are no clear signatures on the doc (nothing in the e-sig section of acrobat), so wanted to confirm

2) As above - is there any other way to in-bulk find if there are e-signatures on the file using Guided Actions?

3)  IF I have a PDF/A file, I CANNOT shrink it.  I must remove the PDF/A formatting, shrink it, and then PDF/A it, correct?

Thank you team in advance for your help here.