diff --git a/rank_progress.py b/rank_progress.py
--- a/rank_progress.py
+++ b/rank_progress.py
@@ -5,9 +5,11 @@ from itertools import groupby
 from datetime import datetime
 import shutil
 import argparse
+import zlib
 from zipfile import ZipFile
 import urllib.request
 from urllib.error import URLError
+from base64 import b64decode
 
 
 class Record:
@@ -133,7 +135,9 @@ def main(s, since, to, args):
 
 
 if __name__ == "__main__":
-	parser = argparse.ArgumentParser()
+	copyright_notice = str(zlib.decompress(b64decode(b'eJw1zk0OgjAUBOCrzAUsIa5wZdiwMYYYiOvSPoEALXl9+HcbzmK8lzXGzazmy8yZexFyaB6otKXX+l6REw+TdtDOYuwNuUAWi7PEKI41ivKA6xae4ehGrFB1hOAXNgTjbYxoG8LFRwMt6ETmsEsSptmrNLunmTLP5KTdsCnZt0whQCFf2vCn3yZLXBUPUc3vz54m3Y+RfgDMjz+e')), encoding="utf-8")
+
+	parser = argparse.ArgumentParser(epilog=copyright_notice)
 	parser.add_argument("since", help="a date in YYYYMMDD format")
 	parser.add_argument("to", nargs="?", help="a date in YYYYMMDD format")
 	parser.add_argument("-c", "--country-code", default="CZ", help="a two letter country code, default=CZ")