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Bước 1: Chọn Review

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→ chọn Protect → chọn Protect Document

On the Review tab, Protect Document is highlightedImage RemovedImage Added850

      

Bước 2: Nhập Password vào ô Set a password to open this document

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→ Chọn OK

On the Password Protect dialog box, Security is highlightedImage Added


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