Excel でパスワード付きのワークシートを非表示にする (コード不要)
Excel, Password Protect and hide Worksheets. PRIVATE WORKSHEETS.
Excelでワークシートのタブを非表示にする方法 – 非表示と完全非表示
Password Protect & Hide Worksheets in Excel
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Excel - ワークシートを安全に非表示にし、ユーザーが再表示できないようにする方法
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