GeoPops
Copyright (C) 2026 Johns Hopkins University

GeoPops is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option) any
later version. See the LICENSE file for the full text.

This file records the third-party origins of parts of this software.


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GREASYPOP-CO
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GeoPops is a successor to GREASYPOP-CO and credits it as its predecessor.

    Copyright 2023 Alexander Tulchinsky
    Licensed under the GNU Affero General Public License, version 3 or later.

src/geopops/process_data.py is derived from GREASYPOP-CO's census data
processing code and retains its original copyright and license notice. Because
that code is licensed under AGPL-3.0-or-later, GeoPops as a whole is
distributed under the same terms.

Alexander Tulchinsky is a collaborator on GeoPops.


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ipfn
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src/geopops/ipfn.py implements iterative proportional fitting. It is derived
from the third-party `ipfn` package, modified so that it works for this
workflow. GeoPops inherited the modified file unchanged from GREASYPOP-CO; the
modifications are Alexander Tulchinsky's.

That file stays under its own MIT terms. Including MIT-licensed code in an
AGPL-licensed work is permitted; the combined distribution is
AGPL-3.0-or-later.

Upstream: https://github.com/Dirguis/ipfn

    The MIT License (MIT)
    Copyright (c) 2016 Damien Forthomme

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
