Lock a document on Mac

To protect documents from being accidentally changed or deleted, you can lock them. When a document is locked, you receive a warning when you move it to the Trash. When you empty the Trash, the locked document is deleted.

On your Mac, do one of the following:

Lock a closed document: Select it, choose File > Get Info, then select Locked.
Lock an open document: Hold the pointer to the right of the document title, click the arrow, then select Locked.

To unlock a document, deselect Locked.

To protect folders and disks, change permissions for them.

See alsoCreate and work with documents on Mac If you don’t have permission to open a file or folder on Mac Get file, folder, and disk information on Mac

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