Security is the security on the folder itself. This applies to the
filesystem.
Sharing Security is on the share; this applies to users coming in over the
network to use the share and is ALSO subject to the security of the
files/folders.
An example may simplify this. Assuming you've shared directory C:\folder as
MYSHARE, then:
Users accessing C:\folder will get the security specified by the Security
tab.
Network Users accessing MYSHARE will get the lesser of the two. The idea is
to use Sharing Security to limit what the maximum access you'll allow on
anything shared through MYSHARE.
This is useful in cases where the underlying filesystem doesn't support
meaningful access control (like FAT or a CDROM drive), or the access
permissions may fluctuate over time, so you don't want to accidentally give
network users write access.
--
Dave Christiansen, Windows Core Security Testing
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