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Today we will learn how to sign a PDF document with a certificate-based digital signature in docHub. First, download docHub for free from its original website. To sign a document with a certificate-based digital signature, obtain a digital ID containing your name, email, organization name, serial number, and expiration date. In docHub, digital IDs are used to sign or add digital signatures to documents. To add or create a digital ID, go to the edit menu, choose preferences, select signatures, click more for identities and trusted certificates, choose digital IDs, and click add ID. If you already have a digital ID, you can add the file. Create a new self-sign digital ID by entering your name, department, organization name, and email address.