When you see a PDF document after opening with a message that it’s signed but not valid, you need to import the necessary .pfx certificate file, if you have the .pfx file simply add it as following:
Adobe reader :: Edit –> Protection –> Security Settings -> Windows Digital IDs then now click on “Add ID” and follow the wizard to impost the certificate.
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Useful information. I wasn't aware of the exact solution to remove such message but finally got a method. Thanks for explaining.
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