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Lock PDF Signed via Digital Certificate

New Here ,
Apr 13, 2023 Apr 13, 2023

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Is it possible to retroactively lock a document signed by digital certificates? For example, the document was signed by everyone but was not locked by the last signer. I then go back and lock it.

Also, is it possible to prevent comments and other editing tools once locked?

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Comment markup and annotate , Security digital signatures and esignatures

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Adobe Employee ,
Apr 14, 2023 Apr 14, 2023

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Hi Justin29395894xpc4,

 

Thank you for reaching out.

 

If the document is digitally signed, it is not possible to make any changes to that PDF.

After digitally signed, the document will add restrictions to adding comments and editing text in the PDF.

You may check the security added to PDF after adding the signature via the document properties. Launch PDF and go to File > Properties > Security.

Let us know if you have any questions.

 

Thanks,

Meenakshi

 

 

Marking a reply or response “Correct” will help future users with the same issue quickly identify the correct answer.

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Community Expert ,
Apr 14, 2023 Apr 14, 2023

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> If the document is digitally signed, it is not possible to make any changes to that PDF.

That's not always the case. If the file is not locked when signed form fields can be filled in, and additional signatures can be applied to it.

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New Here ,
Apr 17, 2023 Apr 17, 2023

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Thanks for the answer!

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New Here ,
Apr 17, 2023 Apr 17, 2023

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Thank you for the clarification, can you lock the document without signing (eg. the last signer forgot to lock the document)? 

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Community Expert ,
Apr 17, 2023 Apr 17, 2023

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In a way. You can apply a security policy that will prevent it from being edited.

To make it really secure, though, you should also apply a policy that requires a password to open it, as just the file-edit policy can be quite easily overcome.

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