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In this tutorial, learn how to sign a PDF document with a certificate-based digital signature in Adobe Acrobat DC. Start by downloading and installing Adobe Acrobat DC for free. To sign a document with a certificate-based digital signature, you need to obtain a digital ID containing information like your name, email address, organization name, serial number, and expiration date. Digital IDs are used in Adobe Acrobat to certify or digitally sign documents. To add or create a digital ID, go to the edit menu, choose preferences, select signatures, click on more for identities and trusted certificates, then choose digital IDs and click add ID. If you already have a digital ID, you can add the file. To create a new self-sign digital ID, type your name, department, organization name, and email address.