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To make a document private and prevent other people from editing your document or even access it, you need to add a password. Passwords in Microsoft Office are so secure that once you have added one to a document, no one will be able to open that document without it. It is a great way to keep your information private and secure and avoid third parties from viewing it. Sensitive information such as salaries, medical information, legal contracts and private letters, can be kept safe from prying eyes.