In some mail from =?iso-8859-1?Q?R=E9mi_Guyomarch?=, sie said:
[...]
> > Forgetting about patents means those who use OpenBSD with pf & ftp-proxy
> > may be open to litigation from others because they're using an unlicensed
> > implementation of the patent
>
> Hmm, correct me if I'm wrong, but I feel that the "ftp proxy" included
> in IPFilter does exactly that. The only difference between IPFilter
> and Daniel's idea about the future of ftp-proxy seems to be that the
> first is kernel-based and the second will be a userland process, no ?

In that case it wouldn't matter as I believe the ftp proxy in ipfilter
predates the patent claim (I might be wrong).

The point being made at the time was that they were patenting a method
for providing a firewall with the safety and protection of proxy services
whilst at the same time having smart proxies which knew when to just let
the traffic straight through. That's even broader than FTP and could
also apply to proxying the HTTP headers and then passing the connection
back to the kernel when you've seen them all, to just let the data rip
right through at full speed (that might also have been a quoted example).

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