diff --git a/CHANGES.txt b/CHANGES.txt
index e3e4378..0ecacec 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,9 @@
-v1.2.0, XX/XX/XX -- TBD
+v1.2.0, 09/18/20 -- search for GAMS in more places, especially on Windows
+                    gdxpds.gdx.GdxSymbol.unload method for user-directed memory managment
+                    convenience functions gdxpds.gdx.append_set and append_parameter
+                    special value handling moved to its own module
+                    clarifying that Python 2.X is not longer supported
+                    general documentation, pylint, and testing improvements
 v1.1.0, 10/09/18 -- fixes to_dataframes and to_gdx memory leaks, respects 
                     GAMS_DIR environment variable, additional bug and warning 
                     fixes. GdxSymbol.dataframe can now be set just using the 
diff --git a/LICENSE b/LICENSE
index 2f2a467..33eadc9 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2018, Alliance for Sustainable Energy.
+Copyright (c) 2020, Alliance for Sustainable Energy.
 All rights reserved.
 
 Redistribution and use in source and binary forms, 
diff --git a/doc/source/conf.py b/doc/source/conf.py
index c489aa7..6ae179a 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -22,7 +22,7 @@
 import gdxpds
 
 project = 'gdx-pandas'
-copyright = '2018, Alliance for Sustainable Energy'
+copyright = '2020, Alliance for Sustainable Energy'
 author = 'Elaine T. Hale'
 
 # The short X.Y version
diff --git a/gdxpds/__init__.py b/gdxpds/__init__.py
index 76553e0..7e7f948 100644
--- a/gdxpds/__init__.py
+++ b/gdxpds/__init__.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/gdx.py b/gdxpds/gdx.py
index 80fc153..ab043a0 100644
--- a/gdxpds/gdx.py
+++ b/gdxpds/gdx.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/test/conftest.py b/gdxpds/test/conftest.py
index 37bcb45..3169b8c 100644
--- a/gdxpds/test/conftest.py
+++ b/gdxpds/test/conftest.py
@@ -1,3 +1,40 @@
+# [LICENSE]
+# Copyright (c) 2020, Alliance for Sustainable Energy.
+# All rights reserved.
+# 
+# Redistribution and use in source and binary forms, 
+# with or without modification, are permitted provided 
+# that the following conditions are met:
+# 
+# 1. Redistributions of source code must retain the above 
+# copyright notice, this list of conditions and the 
+# following disclaimer.
+# 
+# 2. Redistributions in binary form must reproduce the 
+# above copyright notice, this list of conditions and the 
+# following disclaimer in the documentation and/or other 
+# materials provided with the distribution.
+# 
+# 3. Neither the name of the copyright holder nor the 
+# names of its contributors may be used to endorse or 
+# promote products derived from this software without 
+# specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
+# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# [/LICENSE]
+
 import pytest
 
 def pytest_addoption(parser):
diff --git a/gdxpds/test/test_conversions.py b/gdxpds/test/test_conversions.py
index 4fb27df..e2b0f8a 100644
--- a/gdxpds/test/test_conversions.py
+++ b/gdxpds/test/test_conversions.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/test/test_read.py b/gdxpds/test/test_read.py
index d270d18..368bda8 100644
--- a/gdxpds/test/test_read.py
+++ b/gdxpds/test/test_read.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/test/test_session.py b/gdxpds/test/test_session.py
index 9f5c3c4..1c5eda4 100644
--- a/gdxpds/test/test_session.py
+++ b/gdxpds/test/test_session.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/test/test_specials.py b/gdxpds/test/test_specials.py
index 075f258..fa17785 100644
--- a/gdxpds/test/test_specials.py
+++ b/gdxpds/test/test_specials.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/gdxpds/test/test_write.py b/gdxpds/test/test_write.py
index 451441c..57ed94f 100644
--- a/gdxpds/test/test_write.py
+++ b/gdxpds/test/test_write.py
@@ -1,3 +1,40 @@
+# [LICENSE]
+# Copyright (c) 2020, Alliance for Sustainable Energy.
+# All rights reserved.
+# 
+# Redistribution and use in source and binary forms, 
+# with or without modification, are permitted provided 
+# that the following conditions are met:
+# 
+# 1. Redistributions of source code must retain the above 
+# copyright notice, this list of conditions and the 
+# following disclaimer.
+# 
+# 2. Redistributions in binary form must reproduce the 
+# above copyright notice, this list of conditions and the 
+# following disclaimer in the documentation and/or other 
+# materials provided with the distribution.
+# 
+# 3. Neither the name of the copyright holder nor the 
+# names of its contributors may be used to endorse or 
+# promote products derived from this software without 
+# specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
+# CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
+# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# [/LICENSE]
+
 from ctypes import c_bool
 import copy
 import logging
diff --git a/gdxpds/write_gdx.py b/gdxpds/write_gdx.py
index ae080a7..6bb65c5 100644
--- a/gdxpds/write_gdx.py
+++ b/gdxpds/write_gdx.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms, 
diff --git a/setup.py b/setup.py
index 84bea7c..8daa674 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,5 @@
 # [LICENSE]
-# Copyright (c) 2018, Alliance for Sustainable Energy.
+# Copyright (c) 2020, Alliance for Sustainable Energy.
 # All rights reserved.
 # 
 # Redistribution and use in source and binary forms,