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Date: Mon, 5 May 2008 11:00:00 -0700
From: "Kip Macy" <kip.macy@gmail.com>
To: hlwhyw@shtel.net.cn
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References: <424543f9f5.3f9f542454@shtel.net.cn>
Cc: freebsd-net@freebsd.org
Subject: Re: Can I port 4.4BSD-Lite's TCP/IP protocol stack soure code to my
	own OS kernel which is GPL Licenced?
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On Sun, May 4, 2008 at 6:32 AM,  <hlwhyw@shtel.net.cn> wrote:
> Hi, all
>
>  Can I port 4.4BSD-Lite's TCP/IP protocol stack soure code to my own OS kernel which is GPL Licence?
>
>  I know that 4.4BSD-Lite is BSD Licenced. Is it legal to port BSD Licenced code and change it to GPL licence?

Yes. BSD licensed code can, by definition, be included in software
with any license. The only restriction is that you cannot change the
license of the code without permission of the copyright holder.
However, I see no reason to do that.

-Kip