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Permissions are almost the same from Windows NT’s NTFS 4.0 to Windows 2000/XP/2003’s NTFS 5.0. One of the main differences is the way that permissions inherit down through the structure with inherited and explicit permissions. It used to be that, if there was a Deny permission on the ACL, it was always evaluated first, then the Allow permissions would follow. Now, the permission hierarchy must be evaluated considering not only the Deny vs. Allow, but whether the permission is explicitly set or inherited down from a parent resource.
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