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To protect the structure of your workbook, do this
Click Review > Protect Workbook
Click Structure
See the notes below for more about this option and the Windows option
Enter a password in the Password box
While Saving your file you will find the tab call tools (next to save tab ) click tools tab ,than it will show you4 option and select general option among that , and it will ask for password. you can give password and save next time if you want to open the sheet it will ask the password.
je peux protéger mon travail sur excel par un mot de passe
