How to Lock a File on a Mac
If more than one person uses your Mac computer, consider locking private files that you do not want other users to access. When another user attempts to open a locked file, the operating system will issue a warning stating that the user does not have sufficient privileges to read the file. In addition, other users will not be able to delete your locked files.
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Instructions
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Open a new Finder window by clicking on the icon in the Dock.
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Navigate to the location of the file that you want to lock.
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Right-click on the file's icon and choose "Get Info."
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Check the box next to "Locked" in the file's information window.
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Close the information window to save the settings. The selected file is now locked and will not be able to be opened by other users.
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