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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 the official website. A digital ID is required to sign a document, which includes your name, email address, issuing organization, serial number, and expiration date. Digital IDs are used in Adobe Acrobat to certify or add digital signatures to documents. To add or create a digital ID, go to the edit menu, choose preferences, then select signatures and digital IDs. Click on add ID and fill in your information. If you already have a digital ID, you can add it to the program.