Modify Conditional Fields to PDF for Signature - SmallPDF For Free

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Go to File -> Document Properties and select Security tab. Click Edit button to open the Change Document Security dialog. Un-check Allow Filling Form Fields & Signing. Check Password to Change Permissions checkbox and set the permission password.
0:19 1:59 Suggested clip How to set PDF form fields to read only. - YouTubeYouTubeStart of suggested clipEnd of suggested clip How to set PDF form fields to read only. - YouTube
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.
If you are the owner of the digital certificate used to sign the document and the document wasn't locked when signed, you can open the Signatures pane at the left and right-click on the signature to clear it. After that, if the PDF document is a form, you can clear or edit its fields.
Open a PDF that contains multiple signature fields. Right click the first signature field to be signed and choose the Certify with Visible Signature option. The Certify Document window will appear. Click Sign. Save the PDF & enter the password for your Certificate/USB Token.
You hide the field, by opening its property dialog, go to the General tab, and then change "visible" to "hidden" in the field property dropdown. That should do it. If you want to be double sure, make the field read-only as well.
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