License
=======

PIPolars is released under the MIT License.

MIT License
-----------

.. code-block:: text

   MIT License

   Copyright (c) 2024 PIPolars Contributors

   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.

Third-Party Licenses
--------------------

PIPolars depends on the following open-source projects:

Polars
~~~~~~

`Apache License 2.0 <https://github.com/pola-rs/polars/blob/main/LICENSE>`_

Pydantic
~~~~~~~~

`MIT License <https://github.com/pydantic/pydantic/blob/main/LICENSE>`_

pythonnet
~~~~~~~~~

`MIT License <https://github.com/pythonnet/pythonnet/blob/master/LICENSE>`_

PyArrow
~~~~~~~

`Apache License 2.0 <https://github.com/apache/arrow/blob/main/LICENSE.txt>`_

OSIsoft PI AF SDK
-----------------

The OSIsoft PI AF SDK is proprietary software from AVEVA (formerly OSIsoft).
Use of the PI AF SDK requires a valid license from AVEVA.

PIPolars itself does not include or distribute the PI AF SDK. Users must
install the PI AF SDK separately according to their license agreement with
AVEVA.
