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Open the pdf file and Right click on the Question Mark showing the Validity Unknown. Click on Show Signature Properties. Click on Show Signer's Certificate & Select Trust. Click Add to Trusted Identities & Click OK.

Provided the document isn't locked, you can then remove your own signature from the PDF by simply right-clicking the signature and choosing the Clear Signature option. This should remove the signature, allowing you to edit or re-sign the PDF.

If you go to the document properties of a PDF file (control or command d), if the proper metadata is available, it will list the creation date and time and modified date and time. This can help you determine if a pdf file has been modified since creation.

Open the Preferences dialog box. Under Categories, select Signatures. For Verification, click More. To automatically validate all signatures in a PDF when you open the document, select Verify Signatures When The Document Is Opened.

You can easily disable Android application (APK) signature verification using Xposed Framework, but you shouldn't do this in the vast majority of cases. If you've ever tried to modify and reinstall a system application, you probably encountered application signature checks in one form or another.

If you're the only one signer, you can remove the signature and then work on the document or edit the source document. To remove your signature, right-click the signature and then choose Clear Signature.

Sign in to . In the Two-step verification section, select your preferred verification method(s): Adobe Account Access app, email, or text message (SMS). When you select any of these methods, you're prompted to select a backup verification method.

Go to Edit - Preferences - Signatures and click on More next to Verification, and then tick off the "Verify signatures when the document is opened' box. A light blue bar keeps popping up, notifying the user that at least one signature requires validation.