Each signature that you use to certify a document is contained inside a digital certificate. Digital certificates, also known as digital IDs can either be self-signed or issued by a Certificate Authority within an organization. Of course, the signing authority in both cases is within an organization; either you do it yourself, or a central server allocates the certificates.
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Microsoft Windows
Creating Digital Certificates Outside in PowerPoint 2013
Creating Digital Certificates Outside in PowerPoint 2010
Tutorial Code: 16 10 03
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