diff --git a/Makefile b/Makefile
index 08a45dc..ed2c33e 100644
--- a/Makefile
+++ b/Makefile
@@ -29,8 +29,13 @@ build-dep-fed:
 		python3-boto3 \
 		python3-lxml
 
-test:
-# TODO: add tests
+test: copyright
+
+.PHONY: copyright
+copyright:
+	$(eval MISSING_COPYRIGHT := $(shell git ls-files "*.py" | xargs grep -EL "Copyright \(c\) 20.* Aiven|Aiven license OK"))
+	@if [ "$(MISSING_COPYRIGHT)" != "" ]; then echo Missing Copyright statement in files: $(MISSING_COPYRIGHT) ; false; fi
+
 
 unittest: $(generated)
 	$(PYTHON) -m pytest $(PYTEST_ARG) test/
diff --git a/rpm_s3_mirror/__init__.py b/rpm_s3_mirror/__init__.py
index e69de29..dc47a8d 100644
--- a/rpm_s3_mirror/__init__.py
+++ b/rpm_s3_mirror/__init__.py
@@ -0,0 +1 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
diff --git a/rpm_s3_mirror/__main__.py b/rpm_s3_mirror/__main__.py
index de46780..8388787 100644
--- a/rpm_s3_mirror/__main__.py
+++ b/rpm_s3_mirror/__main__.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 import argparse
 import logging
 
diff --git a/rpm_s3_mirror/config.py b/rpm_s3_mirror/config.py
index e2c05cf..3b2db38 100644
--- a/rpm_s3_mirror/config.py
+++ b/rpm_s3_mirror/config.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 import json
 import os
 from abc import abstractmethod
diff --git a/rpm_s3_mirror/mirror.py b/rpm_s3_mirror/mirror.py
index e2719fe..c87784d 100644
--- a/rpm_s3_mirror/mirror.py
+++ b/rpm_s3_mirror/mirror.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 import logging
 import time
 from collections import namedtuple
diff --git a/rpm_s3_mirror/repository.py b/rpm_s3_mirror/repository.py
index 2d5d53c..c8c67d2 100644
--- a/rpm_s3_mirror/repository.py
+++ b/rpm_s3_mirror/repository.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 from collections import namedtuple
 from datetime import datetime
 from typing import Iterator, Dict
diff --git a/rpm_s3_mirror/s3.py b/rpm_s3_mirror/s3.py
index e930efb..038a854 100644
--- a/rpm_s3_mirror/s3.py
+++ b/rpm_s3_mirror/s3.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 import base64
 import functools
 import hashlib
diff --git a/rpm_s3_mirror/statsd.py b/rpm_s3_mirror/statsd.py
index d28ecde..9138196 100644
--- a/rpm_s3_mirror/statsd.py
+++ b/rpm_s3_mirror/statsd.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 """
 StatsD client
 
diff --git a/rpm_s3_mirror/util.py b/rpm_s3_mirror/util.py
index af78a32..a29dee1 100644
--- a/rpm_s3_mirror/util.py
+++ b/rpm_s3_mirror/util.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 import datetime
 import hashlib
 
diff --git a/setup.py b/setup.py
index bc580a2..a7fecae 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2020 Aiven, Helsinki, Finland. https://aiven.io/
+
 from setuptools import setup
 import setuptools