Add or remove a digital signature for Microsoft 365 files
https://support.microsoft.com/en-us/office/add-or-remove-a-digital-signature-for-microsoft-365-files-70d26dc9-be10-46f1-8efa-719c8b3f1a2d
webA digital signature is an electronic, encrypted, stamp of authentication on digital information such as e-mail messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered. Signing certificate and certificate authority
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