How to remove password-encryption in a signed PDF file?

I can open a password-encryption and digitally signed PDF file using Acrobat X Standard but cannot remove the password protection.
Can anyone help me remove the password encryption?  The Acrobat only allows to set passsord encryption before adding digital signature to a PDF file.  Can I sign a PDF file and then encrypt it with password?  Thanks.

Removing the security, if it is possible, would destroy the signature.
Encrypting a signed PDF would destroy the signature.
This is because signatures validate the file exactly as it is, and changes to the file break the signature by design. Setting security is a change to the PDF (a big change).

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