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You can protect a document by using a password to help prevent unauthorized access. 

1. Click the File tab.
   

2. Click Info.
   

3. Click Protect Document, and then click Encrypt with Password.
   

4. In the Encrypt Document box, type a password, and then click OK.
   

5. In the Confirm Password box, type the password again, and then click OK.
   

   NOTE: If When you lose or forget a password, Excel cannot recover your data.encrypt a file using Office 2016, the default encryption method is AES-256

   NOTE: Never email the password to the file in the same email. Either relay the password over the phone or send it in a separate email. 
   

   NOTE: If you lose or forget a password, Excel cannot recover your data.

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