OneNote features
Password Protection: OneNote is designed to help keep your notes safe from prying eyes. When a section is password-protected, all of its pages are locked until you enter the correct password.
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Right-click the section tab you want to protect and then choose Password Protect this Section.
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In the Password Protection task pane, choose Set Password.
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In the Password Protection dialogue box, type the password you want into the Enter Password box.
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Confirm the password by typing it again into the Confirm Password box, and then click OK.