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From: Alexandre Oliva <aoliva@redhat.com>
To: david@lang.hm
Cc: jimmy bahuleyan <knight.camelot@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: how about mutual compatibility between Linux's GPLv2 and GPLv3?
Date: Thu, 21 Jun 2007 17:02:52 -0300	[thread overview]
Message-ID: <orlkedjcsz.fsf@oliva.athome.lsd.ic.unicamp.br> (raw)
In-Reply-To: <Pine.LNX.4.64.0706211055160.31603@asgard.lang.hm> (david@lang.hm's message of "Thu\, 21 Jun 2007 11\:00\:40 -0700 \(PDT\)")

On Jun 21, 2007, david@lang.hm wrote:

> this is standard dual-licensing, not special just becouse both
> licenses are GPL versions

No, seriously, it's not, it's quite different.

If you dual-license your code between GPLv2 and GPLv3, I could combine
your code with code under GPLv3, distribute it, and if anyone tivoized
your code, I might be able to enforce the anti-tivoization provisions
against the tivoizer.

With a mere permission to combine, I can only enforce these provisions
over my own code.


I see that, for tivoization, the end result is very much the same as
an all-GPL, although the tivoizer still has the option of removing the
GPLv3 code and hoping GPLv2's implicit anti-tivoization provisions are
not enforced.  This would be just undoing the additional cooperation
that this additional permission would have provided.

However, for other GPLv3 defenses, it would make a difference.  For
example, on the patent licenses that are implicit in GPLv2 and
explicit in GPLv3.

> and for people who don't like one or the other of the two licenses
> this will not be acceptable becouse it would allow someone else to
> take their work, modify it a bit, and release the result only under
> the license that they don't like

Which is precisely why I suggested this approach of permission to
combine, rather than as dual licensing.  Because then nobody could do
what you say.

> one of the big problems that people don't realize is that if it takes
> GPLv3+ exception to be compatible with the apache license

For the record, it doesn't, GPLv3 is going to be compatible with the
apache 2.0 license, no additional exceptions needed.

-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member         http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}

  reply	other threads:[~2007-06-21 20:03 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-21  9:39 how about mutual compatibility between Linux's GPLv2 and GPLv3? Alexandre Oliva
2007-06-21 11:35 ` jimmy bahuleyan
2007-06-21 17:53   ` Alexandre Oliva
2007-06-21 18:00     ` david
2007-06-21 20:02       ` Alexandre Oliva [this message]
2007-06-21 21:13         ` David Schwartz
2007-06-21 23:37           ` Alexandre Oliva
2007-06-22  0:31             ` David Schwartz
2007-06-22  1:00               ` Alexandre Oliva
2007-06-22  1:34                 ` Al Viro
2007-06-22  4:19                   ` Theodore Tso
2007-06-22  6:00                     ` Alexandre Oliva
2007-06-22 14:43                       ` Theodore Tso
2007-06-25 13:28                       ` Lennart Sorensen
2007-06-25 19:54                         ` Alexandre Oliva
2007-06-26  4:10                           ` Jan Harkes
2007-06-26  6:33                             ` Alexandre Oliva
2007-06-26  7:47                               ` Alexandre Oliva
2007-06-26 16:25                                 ` Jan Harkes
2007-06-27 23:08                                   ` Alexandre Oliva
2007-06-27 23:53                                     ` David Schwartz
2007-06-28  0:56                                       ` Alexandre Oliva
2007-06-28  1:37                                         ` David Schwartz
2007-06-28  2:37                                           ` Alexandre Oliva
2007-06-28  2:51                                             ` Daniel Hazelton
2007-06-28  4:45                                               ` Alexandre Oliva
2007-06-28  4:52                                                 ` Daniel Hazelton
2007-06-28  6:15                                                 ` David Schwartz
2007-06-28 17:40                                                   ` Alexandre Oliva
2007-06-28 19:13                                                     ` David Schwartz
2007-06-30  2:53                                                       ` Alexandre Oliva
2007-06-30  4:04                                                         ` David Schwartz
2007-06-30  6:16                                                           ` Alexandre Oliva
2007-06-28  3:44                                         ` David Schwartz
2007-06-28  4:57                                           ` Alexandre Oliva
2007-06-28  5:08                                     ` Jan Harkes
2007-06-28  6:58                                       ` Alexandre Oliva
2007-06-28 17:52                                         ` Alexandre Oliva
2007-07-01  8:48                                           ` Alexandre Oliva
2007-06-22  9:14                     ` Alan Cox
2007-06-22 14:47                       ` Theodore Tso
2007-06-22 19:14                         ` Alexandre Oliva
2007-06-22  4:26                   ` Alexandre Oliva
2007-06-22  5:23                     ` Al Viro
2007-06-22  6:15                       ` Alexandre Oliva
2007-06-22  9:05               ` Alan Cox
2007-06-22 21:28                 ` David Schwartz
2007-06-21 20:44     ` Jesper Juhl
2007-06-21 23:08       ` Alexandre Oliva
2007-06-21 23:20         ` Jesper Juhl
2007-06-22  0:13           ` Alexandre Oliva
2007-06-21 18:00 ` Al Viro
2007-06-21 20:15   ` Alexandre Oliva
2007-06-21 23:04     ` Al Viro
2007-06-22  0:47       ` Alexandre Oliva
2007-06-21 18:29 ` David Schwartz
2007-06-21 19:56   ` Alexandre Oliva
2007-06-21 20:48     ` David Schwartz
2007-06-21 23:23       ` Alexandre Oliva
2007-06-22  0:58         ` Jan Harkes
2007-06-22  4:14           ` Alexandre Oliva
2007-06-22  4:59             ` Jan Harkes
2007-06-22  1:33         ` Bron Gondwana
2007-06-22  4:40           ` Alexandre Oliva
2007-06-22  1:18 ` Bron Gondwana
2007-06-22  4:34   ` Alexandre Oliva
2007-06-22  5:25     ` Al Viro
2007-06-22  5:31     ` Randy Dunlap

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