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Date:	Tue, 13 May 2014 09:10:19 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	lars@...app.com, Cong Wang <cwang@...pensource.com>,
	Florian Westphal <fw@...len.de>,
	netdev <netdev@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [next PATCH 0/5] net: tcp: DCTCP congestion control algorithm -
 IPR Patent Issue

On Tue, 13 May 2014 18:02:37 +0200
Hagen Paul Pfeifer <hagen@...u.net> wrote:

> On 13 May 2014 17:18, Stephen Hemminger <stephen@...workplumber.org> wrote:
> 
> > This is not enough to allow distribution under GPL.
> > GPL has patent and redistribution clauses that as far as I know
> > are not compatible.
> 
> Sure? IANAL, but as far as I know there is no such thing as "licence a
> *patent* under the GPL". Furthermore, GPLv2 state: "To prevent this,
> we have made it clear that any patent must be licensed for everyone's
> free use or not licensed at all." - this is fulfilled in my opinion.
> 
>  I assume larger parts of the kernel are randomly covered by patents
> to some degree. The "advantage" here is that we know for sure that we
> can use this code without any potential patent claims (the good news
> in a bad world).
> 
> But let other people decide if there is a problem with this particular IPR.
> 
> 
> Hagen

IANAL but my understanding is that FRAND and GPL are not by nature directly
compatible. It is possible for do it but only if the entity claiming IPR
gives a free license to all GPL users. This is the case of the recent Cisco
PIE implementation for example.
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