On 22/01/2008, Cyril Brulebois wrote: > Many thanks for your review, it confirms my initial doubts. It's > been forwarded upstream and dual-licensing is underway. Some background: upstream A uses upstream B's code. B accepted the idea of dual-licensing, but nothing happened yet, and A is being blocked by that at the moment, that's why I'm considering asking A for a formal permission so that A can use a dual-licensed code. Since I know writing copyright stuff from scratch isn't the way to go, I'm wondering if I could get some advice on how to express that dual license in the copyright/license notice. Example of CeCILL-licensed file: ,---- | File : jpeg_buffer.cpp | | Description : Demonstration on how to use the 'jpeg_buffer.h' CImg plugin. | | Copyright : Paolo Prete (p4olo_prete@yahoo.it) | | License : CeCILL | | This software is governed by the CeCILL license under French law and | abiding by the rules of distribution of free software. You can use, | modify and/ or redistribute the software under the terms of the CeCILL | license as circulated by CEA, CNRS and INRIA at the following URL | "http://www.cecill.info";. | | As a counterpart to the access to the source code and rights to copy, | modify and redistribute granted by the license, users are provided only | with a limited warranty and the software's author, the holder of the | economic rights, and the successive licensors have only limited | liability. | | In this respect, the user's attention is drawn to the risks associated | with loading, using, modifying and/or developing or reproducing the | software by the user in light of its specific status of free software, | that may mean that it is complicated to manipulate, and that also | therefore means that it is reserved for developers and experienced | professionals having in-depth computer knowledge. Users are therefore | encouraged to load and test the software's suitability as regards their | requirements in conditions enabling the security of their systems and/or | data to be ensured and, more generally, to use and operate it in the | same conditions as regards security. | | The fact that you are presently reading this means that you have had | knowledge of the CeCILL license and that you accept its terms. `---- Example of CeCILL-C-licensed file: (and target for dual-licensing) ,---- | File : CImg.h | | Description : The C++ Template Image Processing Library | ( http://cimg.sourceforge.net ) | | Copyright : David Tschumperle | ( http://www.greyc.ensicaen.fr/~dtschump/ ) | | License : CeCILL-C | | This software is governed by the CeCILL-C license under French law and | abiding by the rules of distribution of free software. You can use, | modify and or redistribute the software under the terms of the CeCILL-C | license as circulated by CEA, CNRS and INRIA at the following URL | "http://www.cecill.info";. | | As a counterpart to the access to the source code and rights to copy, | modify and redistribute granted by the license, users are provided only | with a limited warranty and the software's author, the holder of the | economic rights, and the successive licensors have only limited | liability. | | In this respect, the user's attention is drawn to the risks associated | with loading, using, modifying and/or developing or reproducing the | software by the user in light of its specific status of free software, | that may mean that it is complicated to manipulate, and that also | therefore means that it is reserved for developers and experienced | professionals having in-depth computer knowledge. Users are therefore | encouraged to load and test the software's suitability as regards their | requirements in conditions enabling the security of their systems and/or | data to be ensured and, more generally, to use and operate it in the | same conditions as regards security. | | The fact that you are presently reading this means that you have had | knowledge of the CeCILL-C license and that you accept its terms. `---- I guess the header could become: ,---- | File : CImg.h | ( C++ header file ) | | Description : The C++ Template Image Processing Library | ( http://cimg.sourceforge.net ) | | Copyright : David Tschumperle | ( http://www.greyc.ensicaen.fr/~dtschump/ ) | | License : CeCILL-C or CeCILL version 2 | ( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html ) | ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html ) `---- But I'm even unsure about how to specify that dual license. Should it be “or”, “and”? Or anything else? Then, header and footer have to be adapted as well, and that's where I'd like to know which kind of statements could be used. And last question, is the following statement something sufficient to make the dual-license effective? ,---- | From: Upstream B | To: Upstream A | Subject: Dual-licensing of … | | [New copyright licensing terms] | | I hereby dual-license … code according to the above-quoted terms. `---- Thanks in advance. Cheers, -- Cyril Brulebois
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