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Learn how to sign a PDF document with a certificate-based digital signature in Adobe Acrobat DC. Download and install Adobe Acrobat DC. Obtain a digital ID containing your name, email address, organization name, serial number, and expiration date. Digital IDs certify or add digital signatures to documents. To add or create a digital ID, go to Edit > Preferences > Signatures > More for Identities and Trusted Certificates > Digital IDs > Add ID. Enter your information to create a new digital ID or use an existing one from your organization.