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hi guys today we are going to see how to sign a PDF document with a certificate-based digital signature in docHub first of all download and docHub from its original website for free to sign a document with a certificate-based digital signature you must obtain a digital ID a digital ID contains information like your name email address name of the organization that issued it a serial number and an expiration date in docHub digital IDs are used to docHub documents or add digital signature to documents so follow the steps to add or create a digital ID click the edit menu choose the preferences signatures on the right click more for identities and trusted certificates select digital IDs on the left and then click the add ID button if you already have a digital ID from your organization you can select this option to add the digital ID file to show you I am going to create a new cell sign digital ID type your name Department organization name and email address for