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When signing a normal PDF file, the certificate shown at Adobe Reader is valid. But if I change the security setting of this PDF file and sign again, Adobe Reader shows that the document has been altered. I tr…...PKCS7(pfx, pfxPassword); // PKCS#7 or signature.setShowProperties(false);...(164.5 KB) test_signature.png (6.7 KB) mudassir.fayyaz April 16,...