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How to put a watermark after 1st signer signed a PDF?

I have a multiple signers case:

  • Signer 1 already signed and I set the CertificationLevel to 3

  • Signer 2 put watermark into that PDF, I do the following process flow:

  • Prepare PDF that already signed by signer 1 (prepared_for2.pdf)

  • inject the 2nd signer p7s into prepared_for2.pdf

it looks like only commentting, form fill-in, signing, page adding action are allowed..

is there any way to allow the 2nd signer put watermark (ie. decline image) into a PDF after the 1st signer signed?

Need help

many thanks in advance

Regards Don

Don2
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  • Please read [this answer](https://stackoverflow.com/a/16711745/1729265) for allowed and disallowed changes to a signed PDF. Essentially changes to the static page content never are allowed. But you could add an annotation with an appearance that serves as a watermark – mkl May 18 '20 at 17:36
  • Can you provide me the example link for creating annotation that serves as a watermark? TIA – Don2 May 19 '20 at 11:57
  • Have you had a look at the code in [this question](https://stackoverflow.com/q/57843823/1729265)? – mkl May 19 '20 at 14:40

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