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Office documents are sometimes used as legal documents and often require a signature. Or, sometimes, you may want to add an invisible signature to protect the integrity of the document. You can do either in certain Office apps.

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Source: https://www.howtogeek.com/759657/how-to-add-or-remove-a-digital-signature-in-microsoft-office-files/
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The Article Was Written/Published By: Marshall Gunnell