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In this tutorial, learn how to lock a PDF file with certificate security in DocHub Accurate Pro DC. First, open your PDF file with DocHub and click on the file option, then properties, and select security. Choose certificate security and encryption algorithm. Add your digital ID, including your name, email address, and password. Save the location and finish the process. Your PDF file is now locked with certificate security. Save and open it with your password. Subscribe, like, share, and comment.