Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764778AbXFRTiH (ORCPT ); Mon, 18 Jun 2007 15:38:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761435AbXFRTh4 (ORCPT ); Mon, 18 Jun 2007 15:37:56 -0400 Received: from mx1.redhat.com ([66.187.233.31]:41733 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759353AbXFRThz (ORCPT ); Mon, 18 Jun 2007 15:37:55 -0400 To: david@lang.hm Cc: Greg KH , Al Viro , Daniel Hazelton , Bron Gondwana , Ingo Molnar , Alan Cox , Linus Torvalds , debian developer , Tarkan Erimer , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: Dual-Licensing Linux Kernel with GPL V2 and GPL V3 References: <200706161817.36657.dhazelton@enter.net> <200706162306.14516.dhazelton@enter.net> <20070617051451.GD21478@ftp.linux.org.uk> <20070618154549.GB6041@kroah.com> From: Alexandre Oliva Organization: Red Hat OS Tools Group Date: Mon, 18 Jun 2007 16:20:18 -0300 In-Reply-To: (david@lang.hm's message of "Mon\, 18 Jun 2007 11\:32\:41 -0700 \(PDT\)") Message-ID: User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.990 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1897 Lines: 43 On Jun 18, 2007, david@lang.hm wrote: > do you realize that redhat uses checksums or signatures to check the > validity of their CD's? Yes. How does this stop the users from enjoying any of the freedoms? > I seriously doubt if redhat tells you how to how to generate such a > checksum/signature. Mixing two different issues here. The checksums embedded in the ISO images are implemented in anaconda itself, provided along with the distro, so anyone can generate them, even though I don't know the precise algorithm. The checksums over the ISO images themselves are implemented with sha1sum (earlier, md5sum), so anyone can generate them too. As for the GPG signatures in the RPMs and in the SHA1SUM file, these are indeed generated using public algorithms but private keys. But these signatures are not functional, and they don't in any way stop anyone from enjoying freedoms. > in addition to the problem that Linus points out about being unable to > change the contents of the write-only CD this would seem to conflict > with what you are claiming the GPL is supposed to allow. It looks like you read only Linus' messages, not my responses. A write-only CD is like ROM. It's not the distributor who's imposing restrictions on its modification. Nobody can modify it because nature says so. It's not like the software is being recorded in a CD as a means to prevent you from modifying it. -- 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} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/