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Authentication measures for electronic signatures. Authentication methods verify the signer's identity and the signature's accuracy. These methods include biometrics, digital certificates, and public key infrastructure. They allow the signer to prove their identity and the integrity of the signature.

To keep your electronic signature safe, you should always protect the document from editing. Open the PDF document with Adobe Acrobat Pro/Reader DC or XI application. On the right side, click “Protect” to open the “Protect” options. Click on “Protect Using Password” option.

When you sign a PDF using your digital ID, the PDF becomes read-only for others. If you received a PDF digitally signed by others, you can sign it, but can't edit it. While signing a PDF, if the signer chooses to lock the document after signing, the document becomes read-only for everyone, including the signer.

Occasionally, you or the signer may choose to lock the document after signing. In this case, the document becomes read-only and no further changes are allowed; even a signature can't be added in the document. The Lock document after signing option is useful if you're the last signer or the only one signer.

Open the PDF in Acrobat. Choose File > Protect Using Password. Alternatively, you can choose Tools > Protect > Protect Using Password. Select if you want to set the password for Viewing or Editing the PDF.

Use ""Save As"" option: Some PDF editors have the option to save a copy of the signed PDF with a new name and make changes to the copy. This way the original signed PDF will remain unchanged. Print and Scan: You can print the signed PDF, make the changes on the paper and then scan it back to a PDF format.

How to lock a PDF form after signing it Open a PDF in Adobe Acrobat Pro and choose Forms & Signatures > Prepare Form. Double-click the necessary signature field to open its Properties. In Signed, tick the box Mark as read-only. Save changes.

You can add an invisible digital signature to prevent your name from appearing in a document. Open your document and click the File tab. Click Info and then click Protect Document. From the Protect Document drop-down menu, click Add a Digital Signature.