occ, a library for quantum chemistry & crystallography
Copyright (C) 2023-2025 Peter Spackman

This software is dual-licensed. You may use, redistribute, and/or modify
it under the terms of either:

  - The GNU General Public License, version 3 or later (GPLv3+), OR
  - The GNU Lesser General Public License, version 3 or later (LGPLv3+)

at your option.

This software 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 or GNU Lesser General Public License for
more details.

You should have received a copy of both licenses along with this software.
If not, see <https://www.gnu.org/licenses/>.

If you are interested in other licensing options, please contact the author.
