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+from the README:
+
+Passive OS fingerprinting is based on information coming from a remote host
+when it establishes a connection to our system.  Captured packets contain
+enough information to identify the operating system.  In contrast to active
+scanners such as nmap and QueSO, p0f does not send anything to the host being
+identified.
+  
+For more information, read Spitzner's text at:
+http://www.enteract.com/~lspitz/finger.html .
+
+from the maintainer:
+
+Use of this program requires read access to the packet filtering
+device, typically /dev/bpf0.  Granting such access allows the users
+who have it to put your Ethernet device into promiscuous mode and
+sniff your network.  See
+http://www.infoworld.com/articles/op/xml/00/05/29/000529opswatch.xml
+if you do not understand how this can be harmful.  Running p0f with
+no options will cause it to analyse packets intended for other
+hosts.
+
+Trevor Johnson
+trevor@jpj.net