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Bước 1: Mở file PDF cần khoá → chọn File → chọn Print

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Bước 2: Chọn Save as PDF như hình dưới.

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Bước 3: Chọn Security Options...

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Bước 4: Tích chọn vào ô Require password to open document → Nhập password → Chọn OK

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