You can protect a document by using a password to help prevent unauthorized access.
Click the File tab.
Click Info.
Click Protect Document, and then click Encrypt with Password.
In the Encrypt Document box, type a password, and then click OK.
In the Confirm Password box, type the password again, and then click OK.
NOTE: If you lose or forget a password, Excel cannot recover your data.
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.
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