If you are worried about the security of your PowerPoint presentation then besides password protecting a PowerPoint you can also sign the PowerPoint presentation with a digital signature or Digital ID.
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How to Create an Electronic Signature in Microsoft Word [2024
Digital Signature Powerpoint Template is one of the best
PPT - Digital Signature software PowerPoint Presentation, free
How to add a Digital Signature in PowerPoint ?
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Add signature to PowerPoint documents (PPT, PPTX), the 100% faster way
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How to Create an Electronic Signature in Microsoft Word [2024
Obtain a digital certificate and create a digital signature
DocuSign eSignature: How To Sign a Document