The System Profiler in Mac OS X 10.4.2 labels a Bluetooth device with "Requires Authentication: No" even when the user has selected the "Require pairing for security" option, which could confuse users about which setting is valid.
http://lists.apple.com/archives/security-announce/2005/Aug/msg00000.html
http://lists.apple.com/archives/security-announce/2005//Aug/msg00001.html