Password protecting an already digitally signed pdf

[mc2969]

Is it possible to password protect a pdf that has been already digitally signed?

[Bernd Alheit]

No.

[mc2969]

Thank you Bernd for you reply. Would you or anyone happen to know how to remove the certificate of a copy of the signed pdf? Because password protecting a file is not possble after its been digitally signed, we need to find a way to unlock the pdf (that has been digitally signed) in order to redact it for storing the file securely. Any ideas and or advise is really appreciated. Thanks.

[Bernd Alheit]

When you have signed the file you can delete the signature.

[mc2969]

Hi Bernd, Can or Cannot?

[mc2969]

I hope that removeing the signiture will unlock the file. Thanks Bernd. All of this is because of the COVID-19 crisis and our users needing to work from home. Just in case anyone is wondering.

[margueritek]

Only the signer can remove his signature. Since the signature prevents modification of the file (including redaction). If you need to store a redacted version of the file, I suggest scanning a printout and redacting that.