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In this tutorial, we learn how to sign a PDF document with a certificate-based digital signature in docHub. To do this, first download and install docHub from the original website. A digital ID is needed, which contains information like your name, email address, organization name, serial number, and expiration date. In docHub, digital IDs are used to sign or add digital signatures to documents. Follow the steps to add or create a digital ID in docHub by going to the edit menu, choosing preferences, selecting signatures, and then adding a new digital ID. If you already have a digital ID from your organization, you can add the digital ID file.