Quoting Francisco Baena (francisco_baena at lycos.es):
> I know that Stateful inspection was develped and patented by Check Point. Is
> there any Open Source project based on Stateful Inspection?
iptables/netfilter in Linux kernel 2.4.x/2.5.x does stateful filtering.
To find out whether it infringes any patents, consult your friendly local
software-knowledgeable patent attorney, who will be grateful for your
patronage.
http://netfilter.samba.org/
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