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The tutorial explains how to sign a PDF document with a certificate-based digital signature in Adobe Acrobat DC. To do this, you need to download and install Adobe Acrobat DC and obtain a digital ID containing information like your name, email address, organization, serial number, and expiration date. Digital IDs 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 finally click the add ID button. If you already have a digital ID, you can add the digital ID file. Type your name, department, organization name, and email address to create a new digital ID.