Set a password
To set a password to open a document, follow the steps below:
1.Open the document you want to protect with a password.
2.On the Protection tab, click 
Set password. When working in macOS, you can also run the File > Set password command from the command menu.
3.In the Set password window that appears, enter a password for the document and confirm it.
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For security reasons, all characters in passwords are replaced with dots. To display the password characters, click the |
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4.Click OK.
Once the verification is successfully completed, you will see a notification confirming the entered passwords match. Save the document to confirm the changes.
Next time the document is opened, you will be requested to enter a password prior to displaying the document content.
