The Allow Files With Read-Only Attributes to be Shredded setting allows Identity Finder to ignore the read-only attribute specified by Windows Explorer and to shred read-only files. This is off by default and should be used with caution.
To view or modify this setting, click the Configuration ribbon, then the Settings button. For additional settings please refer to Change the Behavior of the Actions Used to Protect Identities or Settings to Customize Your Experience.