How do I know it's real?
If you find a need to provide some sort of certification that your document has not been tampered with and is the real thing, you might consider a digital signature.
This Microsoft Support article discusses the process.
What is a digital certificate?
What is a digital signature?
What occurs when I use a digital signature?
What Word files can I sign?
How can I obtain a digital signature?
- Method 1: Obtain a digital certificate from a certification authority
- Method 2: Create your own digital certificate
Here's information for Excel.
Digital Signatures for Excel
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