nirs4all-providers is dual-licensed, consistent with the nirs4all ecosystem policy:

    CeCILL-2.1 OR AGPL-3.0-or-later

You may use, modify, and redistribute this software under the terms of either
the CeCILL Free Software License Agreement v2.1 or the GNU Affero General Public
License version 3 (or, at your option, any later version), at your choice.

  - CeCILL-2.1:        https://cecill.info/licences/Licence_CeCILL_V2.1-en.html
  - AGPL-3.0-or-later: https://www.gnu.org/licenses/agpl-3.0.html

SPDX-License-Identifier: CeCILL-2.1 OR AGPL-3.0-or-later
