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This tutorial demonstrates how to lock a PDF file with certificate security in DocHub Accurate Pro DC. Open the PDF file in DocHub, click on the file option, then properties and select security. Choose certificate security, encrypt all document content, select an encryption algorithm, add a digital ID with name and email, create a password, save location, finish, and close the PDF file. Save and open the file, enter the password to access. Subscribe, like, share, and comment on the video.