Re: [PATCH v4 03/21] acpi: Re-license ACPI builder files from GPLv2 to LGPLv2.1

From: Lars Kurth <lars.kurth@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	Ian Jackson <Ian.Jackson@citrix.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Wei Liu <wei.liu2@citrix.com>,
	Kouya Shimura <kouya@jp.fujitsu.com>,
	Andrew Cooper <Andrew.Cooper3@citrix.com>,
	"julien.grall@arm.com" <julien.grall@arm.com>,
	Simon Horman <horms@verge.net.au>,
	"keke@lenovo.com" <keke@lenovo.com>,
	"jbeulich@suse.com" <jbeulich@suse.com>,
	"zhaoshenglong@huawei.com" <zhaoshenglong@huawei.com>,
	Stefan Berger <stefanb@us.ibm.com>,
	"Keir (Xen.org)" <keir@xen.org>,
	Daniel Kiper <dkiper@net-space.pl>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [PATCH v4 03/21] acpi: Re-license ACPI builder files from GPLv2 to LGPLv2.1
Date: Tue, 20 Sep 2016 10:17:48 +0000	[thread overview]
Message-ID: <D406C4D3.2E0A4%lars.kurth@citrix.com> (raw)
In-Reply-To: <1474330779-10645-4-git-send-email-boris.ostrovsky@oracle.com>

On 20/09/2016 01:19, "Boris Ostrovsky" <boris.ostrovsky@oracle.com> wrote:

>ACPI builder is currently distributed under GPLv2 license.
>
>We plan to make the builder available to components other
>than the hvmloader (which is also GPLv2). Some of these
>components (such as libxl) may be distributed under LGPL-2.1
>so that they can be used by non-GPLv2 callers.  But this
>will not be possible if we incorporate the ACPI builder in
>those other components.
>
>To avoid this problem we are relicensing sources in ACPI
>bulder directory to the Lesser GNU Public License (LGPL)
>version 2.1
>
>(dsdt.asl remains GPLv2 as we might need permission from Lenovo
>due to commit 801d469ad ("[HVM] ACPI support patch 3 of 4: ACPI
>_PRT table."))
>
>Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
>Acked-by: Daniel Kiper <dkiper@net-space.pl>
>Acked-by: Stefan Berger <stefanb@us.ibm.com>
>Acked-by: Kouya Shimura <kouya@jp.fujitsu.com>
>Acked-by: Jan Beulich <jbeulich@suse.com>
>Acked-by: Kevin Tian <kevin.tian@intel.com>
>Acked-by: Keir Fraser <keir@xen.org>
>Acked-by: Simon Horman <horms@verge.net.au>
>Acked-by: Lars Kurth <lars.kurth@citrix.com>
>Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [for Oracle,
>VirtualIron and Sun contributions]
>---
>CC: Daniel Kiper <dkiper@net-space.pl>
>CC: Stefan Berger <stefanb@us.ibm.com>
>CC: Kouya Shimura <kouya@jp.fujitsu.com>
>CC: Jan Beulich <jbeulich@suse.com>
>CC: Kevin Tian <kevin.tian@intel.com>
>CC: Keir Fraser <keir@xen.org>
>CC: Simon Horman <horms@verge.net.au>
>CC: Lars Kurth <lars.kurth@citrix.com>
>CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
>CC: keke@lenovo.com
>---
>
>Changes in v4:
>* Dropped dsdt.asl until Lenovo ACK is received (note that mk_dsdt.c *is*
>made LGPL)
>
> tools/firmware/hvmloader/acpi/Makefile        | 18 ++++++++----------

The directory tools/firmware/hvmloader/acpi/ should contain a COPYING file
containing the text following text

[1] http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/libxc/COPYING

I would replace the following block in [1] with a more verbose
description, 
which provides additional context and states our intention.

1 Note that the only valid version of the LGPL as far as the files in
   2 this directory (and its subdirectories) are concerned is _this_
   3 particular version of the license (i.e., *only* v2.1, not v2.2 or v3.x
   4 or whatever), unless explicitly otherwise stated.

This library is licensed under LGPL v2.1 to allow its usage in LGPL-2.1
libraries such as libxl. Note that the only valid version of the LGPL as
far as the files in this directory (and its subdirectories) are concerned
is _this_ particular version of the license (i.e., *only* v2.1, not v2.2
or v3.x, unless explicitly otherwise stated.

After this block

6 Where clause 3 is invoked in order to relicense under the GPL then
   7 this shall be considered to be GPL v2 only for files which have
   8 specified LGPL v2.1 only.

add

gpl sub-directory
=================
This directory contains a gpl sub-directory which contains code licensed
under the GPL v2, because we have not yet been able to get the permission
to relicense the relevant code to LGPL v2.1. See gpl/COPYING for more
information.

The makefile in this component allows to build a GPL and LGPL only
variant of this library, the latter omits all GPL source code.

Regards
Lars

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