diff --git a/data.py b/data.py
index dea4584..4e4e7ff 100644
--- a/data.py
+++ b/data.py
@@ -1,3 +1,22 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2024 Simon Forman
+#
+#    This file is part of game
+#
+#    game is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    game is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with game.  If not see <http://www.gnu.org/licenses/>.
+#
 '''
 I could use SQLite for a data file format, or just pickle.
 '''
diff --git a/poisson.py b/poisson.py
index 3582afe..e8d602f 100644
--- a/poisson.py
+++ b/poisson.py
@@ -1,3 +1,22 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2024 Simon Forman
+#
+#    This file is part of game
+#
+#    game is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    game is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with game.  If not see <http://www.gnu.org/licenses/>.
+#
 '''
 Poisson Distribution
 '''
diff --git a/server.py b/server.py
index 03eb61f..dff7f63 100644
--- a/server.py
+++ b/server.py
@@ -1,3 +1,22 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2024 Simon Forman
+#
+#    This file is part of game
+#
+#    game is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    game is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with game.  If not see <http://www.gnu.org/licenses/>.
+#
 from random import randint, expovariate, seed
 from data import save
 from poisson import poisson
diff --git a/ui.py b/ui.py
old mode 100644
new mode 100755
index 5e1f69b..3fc8002
--- a/ui.py
+++ b/ui.py
@@ -1,7 +1,24 @@
-from fractions import Fraction as ratio
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2024 Simon Forman
+#
+#    This file is part of game
+#
+#    game is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    game is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with game.  If not see <http://www.gnu.org/licenses/>.
+#
 from tkinter import *
-from PIL import Image
-from PIL.ImageTk import PhotoImage
 
 from data import load