diff --git a/data/dns-sinkhole_gen.py b/data/dns-sinkhole_gen.py
index 72252dd..87ad8ea 100755
--- a/data/dns-sinkhole_gen.py
+++ b/data/dns-sinkhole_gen.py
@@ -1,11 +1,27 @@
 #!/bin/env python3
 
+# Copyright 2019 Pekka Helenius
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+# and associated documentation files (the "Software"), to deal in the Software without restriction,
+# including without limitation the rights to use, copy, modify, merge, publish, distribute,
+# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all copies or
+# substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+########################################
+
 # Simple DNS sinkhole file generation for DNSCrypt & pdnsd servers
-#
 # Block DNS query resolutions for specific network domains
-#
-# Author: Pekka Helenius (~Fincer), 2019
-#
+
 ########################################
 
 import os