How to post pictures of RT in a book?

patdavid · February 8, 2016, 3:34pm

Do you mean legal requirements? Not sure.

I don’t think there would be a problem, as the project and associated files are GPLv3

Beep6581/RawTherapee/blob/dev/LICENSE.txt

    RawTherapee - A powerful, cross-platform raw image processing program.
    Copyright (C) 2004-2012 Gabor Horvath <hgabor@rawtherapee.com>
    Copyright (C) 2010-2021 RawTherapee development team.

    RawTherapee 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.

    RawTherapee 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 <https://www.gnu.org/licenses/>.

                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

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I would defer to @Morgan_Hardwood to be sure.