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In this tutorial, the process of locking a PDF file with certificate security using DocHub Accurate Pro DC is demonstrated. To begin, open the PDF file with DocHub and access the properties option. Select the security option, choose certificate security, and proceed to encrypt all document content or accept metadata. Select an encryption algorithm, create a digital ID with your name and email address, set a password, and choose a save location. Finish the process and open the PDF file with the newly applied security measures. Remember to enter the password to access the file.