Digital Signature Validity Unknown OR Signature Not Verified on PDF Solutions
Facing Validity Unknown or Digital Signature not verified or Digital Signature Validity Unknown error while signing a PDF file with Digital Signature ? This error is very common while signing a pdf file.
Today we will explain the solution for this error.
Step 1: Right click on Signature and Click on Validate Signature
Step 2: One popup will be opened, Click on Signature Properties
Step 3 : On next screen, Click on Show Signer's Certificate button.
Step 4: On next screen, Click on Trust Tab and then click on Add to Trusted Certificates
Step 5: One pop up will be opened, Click on OK.
Step 6: On next screen tick / click all Tick Box as shown in below screenshot and click on OK.
Step 7: On next screen click on OK
Step 8: Now click on Validate Signature
Step 9: On next screen, it will show you Signature is VALID. Click on Close button.
Step 10: In pdf also, you will see Signature Valid.
