RAR archive format supports archive locking. The locked archive cannot be modified by WinRAR. You may lock important archives to prevent their accidental modification.
Archive locking is not intended or able to prevent modification by other tools or willful third party. It implements a safety measure only for accidental data change by WinRAR.
Use "Lock archive" command in WinRAR shell mode or command "K" in the command line to lock an archive.
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