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Today, we will learn 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 from its original website for free. A digital ID is required to sign a document with a certificate-based digital signature, containing information such as your name, email address, the organization issuer's name, serial number, and expiration date. In Adobe Acrobat, digital IDs are used to certify documents or add digital signatures. To create a digital ID, go to the edit menu, choose preferences, click on signatures, select digital IDs, and then click add ID. You can also add a digital ID file if you already have one from your organization. Fill in your name, department, organization name, and email to create a new self-sign digital ID.