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Date: Wed, 26 Nov 2008 10:14:43 +0300
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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To: "Sean C. Farley" <scf@FreeBSD.org>
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Cc: bf2006a@yahoo.com, Tim Kientzle <kientzle@FreeBSD.org>,
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Subject: Re: lzma compression/decompression in bsdtar/libarchive?
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Sean C. Farley wrote:
> On Tue, 25 Nov 2008, Tim Kientzle wrote:
> 
>> Where is the announcement of this change?
>>
>> I haven't downloaded the code yet, but the
>> sourceforge project pages all still say GPL.
> 
> It is on the SDK page:  http://www.7-zip.org/sdk.html

I think you need contact to author.
I don't see information about public domain on russian page
http://7-zip.org.ua/ru/sdk.html (may be it is translation bug :).
LZMA is avaiable under one of three license:
1. GNU LGPL
2. CPL
3. Special author's license (you can use code, but can't change it)

-- 
WBR, Andrey V. Elsukov