Hypothetical licensing question
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If I modify program foobar, which is GPL licensed, how should the copyright/license text look? If program X is licensed like this:
Copyright (C) 2004 John Jones
Foobar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
And I want to release my version under the GPL version 3, or any later version, should (and can) I change the text to:
Copyright (C) 2004 John Jones
Copyright (C) 2013 ssdclickofdeath (my real name, instead)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
>If program X is licensed like this:
I meant program foobar.
I believe that's exactly what you should do. If you find yourself in a more complex situation, you can get expert advice from name at domain
I suppose I'll learn programming soon, and I want to know how to do the licensing properly.
Yep, in that example you're adding your copyright notice and also upgrading to v3 of the GPL, which was allowed since the original person published it as v2-or-later.
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