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Tiger includes support for AccessControlLists (ACL) which adds new complexity to file security.

Note: you have to turn it on first using the command line tool “fsaclctl”

A small application with sample cocoa code is now available from:

It demonstrates simply how to read the acl info for a file, as I know of no cocoa/carbon API yet (though apparently Mac OS X server workgroup manager has a few extra preference panes to get and set this info).

Some more info at: and