Licenses
========

`cysgp4` itself is published under `GPL v3 <https://www.github.com/bwinkel/cysgp4/blob/master/COPYING.GPLv3.txt>`_, an open-source license. The package
is a `Cython <https://www.cython.org>`_-powered wrapper of the `sgp4lib
<https://www.danrw.com/sgp4/>`_ library (by Daniel Warner) to compute
satellite positions from two-line elements (TLE). The sgp4lib source code is
licensed under `Apache-2.0 license
<https://www.github.com/bwinkel/cysgp4/blob/master/COPYING.Apache2>`_

The package is partly based on the `Astropy-affiliated package template <https://github.com/astropy/package-template>`_, which is under `BSD 3-clause <https://github.com/bwinkel/cysgp4/blob/master/TEMPLATE_LICENCE.rst>`_ license.