improve/add license headers

changepw.py

@@ -1,5 +1,31 @@
 #!/usr/bin/env python
 
+########################################################################
+#  Copyright (C) 2016 Max Mehl <mail [at] mehl [dot] mx>
+########################################################################
+#  
+#  This program is free software: you can redistribute it and/or modify 
+#  it under the terms of the GNU Affero General Public License as 
+#  published by the Free Software Foundation, either version 3 of the 
+#  License, or (at your option) any later version.
+#  
+#  This program 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 Affero General Public License for more details.
+#  
+#  You should have received a copy of the GNU Affero General Public 
+#  License along with this program.  If not, see 
+#  <http://www.gnu.org/licenses/>.
+#  
+########################################################################
+#  
+#  This script is responsible to change a password using vpasswd. It is 
+#  needed because we need the expect function and using python we can 
+#  avoid potential password leaks when other users see the output of ps.
+#  
+########################################################################
+
 import sys
 import pexpect