Changed MIT license back to GPLv3

README.rst

@@ -21,7 +21,7 @@ PynPoint
 .. image:: https://www.codefactor.io/repository/github/pynpoint/pynpoint/badge
     :target: https://www.codefactor.io/repository/github/pynpoint/pynpoint
 
-.. image:: https://img.shields.io/badge/license-MIT-blue.svg?style=flat
+.. image:: https://img.shields.io/badge/License-GPLv3-blue.svg
     :target: https://github.com/PynPoint/PynPoint/blob/master/LICENSE
 
 .. image:: http://img.shields.io/badge/arXiv-1811.03336-orange.svg?style=flat
@@ -58,7 +58,7 @@ License
 
 Copyright 2014-2020 Tomas Stolker, Markus Bonse, Sascha Quanz, Adam Amara, and contributors.
 
-PynPoint is distributed under the MIT License. See the LICENSE file for the terms and conditions.
+PynPoint is distributed under the GNU General Public License v3. See the LICENSE file for the terms and conditions.
 
 Acknowledgements
 ----------------

pynpoint/__init__.py

@@ -98,7 +98,7 @@
 warnings.simplefilter('always', DeprecationWarning)
 
 __author__ = 'Tomas Stolker & Markus Bonse'
-__license__ = 'MIT'
+__license__ = 'GPLv3'
 __version__ = '0.8.1'
 __maintainer__ = 'Tomas Stolker'
 __email__ = 'tomas.stolker@phys.ethz.ch'

setup.py

@@ -26,14 +26,14 @@
               'pynpoint.util'],
     include_package_data=True,
     install_requires=reqs,
-    license='MIT',
+    license='GPLv3',
     zip_safe=False,
     keywords='pynpoint',
     classifiers=[
         'Development Status :: 4 - Beta',
         'Intended Audience :: Science/Research',
         'Topic :: Scientific/Engineering :: Astronomy',
-        'License :: OSI Approved :: MIT License',
+        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
         'Natural Language :: English',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',