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In this tutorial, we will learn how to sign a PDF document with a certificate-based digital signature in Adobe Acrobat DC. To begin, download and install Adobe Acrobat DC from its original website. A digital ID is needed to sign a document, containing information such as your name, email address, organization name, serial number, and expiration date. Digital IDs in Adobe Acrobat are used to certify documents or add digital signatures. To add or create a digital ID, go to the edit menu, choose preferences, select signatures, then digital IDs, and click the add ID button. If you already have a digital ID, you can add it to the program. Enter your name, department, organization name, and email to create a new self-sign digital ID.