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In order to encrypt a PDF file, you need to create PdfFileSecurity object and then call the EncryptFile method. You can pass user password, owner password and Dec 29, 2005 - Nov 13, 2017 - However, if the file is thoroughly encrypted, you can only unlock the file by providing the correct password. The decryption process should start right away. Dec 10, 2019 - Oct 23, 2019 - Sep 7, 2017 - Sep 7, 2017 - Jul 25, 2013 -