Situatie
You can help prevent unauthorized users from opening or modifying a workbook file, even if they have permission to open it.
Caution: When you create a password for a workbook, write down the password and keep it in a secure place. If you lose the password, you can’t open or gain access to the password-protected workbook.
Solutie
Pasi de urmat
Open the sheet or workbook that you want to protect.
On the Review tab, click Protect Sheet or Protect Workbook.
In the Password box, type a password, and in the Verify box, type the password again.
Choose any other protection options you want and click OK then Save.
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