Redmine

Note that in each file header, we currently specify the following:

# 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 2
# of the License, or (at your option) any later version.

As such, Redmine is licensed under the GPL 2.0 or any later version, currently either GPLv2 or GPLv3. This distinction should not (and can not easily) be removed as it would require the consent of all contributors (which can not be easily obtained).

As such, I'd rather propose to add the text from the current file headers to the new LICENSE.TXT file, e.g. the following slightly adapted text as a combination of your proposal with the existing text from all our file headers:

Redmine - project management software
Copyright (C) Jean-Philippe Lang

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 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.

For the full text of the license, please see the `COPYING` file
located in the `doc` directory.

You can also find the full text of the GPL version 2 at the Free
Software Foundation's website at

https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html

or by writing to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.