OneNote 2013
You can keep your private notes safe from prying eyes by protecting a notebook section with a password. 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, then click Password Protect this Section.
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In the Password Protection task pane, click Set Password.
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In the Password Protection dialog 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, then click OK.
