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Put an item in a folder: Drag it to the folder. On your Mac, click the Finder icon in the Dock to open a Finder window.
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Locking the file does not mean encrypting it with password and not letting anyone else to check it out. If your Hard Drive holds sensitive and important data on your computer then you also must protect it too. Locking the files does not mean encrypting and not allowing other to access it. This post covers how to lock files and folders in macOS Ventura, Monterey, Catalina, Big Sur and older versions of macOS.
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