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diff --git a/src/add_python/lilliput/ae_common.py b/src/add_python/lilliput/ae_common.py
index 033b5b0..83db056 100644
--- a/src/add_python/lilliput/ae_common.py
+++ b/src/add_python/lilliput/ae_common.py
@@ -1,3 +1,20 @@
+# Implementation of the Lilliput-AE tweakable block cipher.
+#
+# Authors, hereby denoted as "the implementer":
+# Kévin Le Gouguec,
+# Léo Reynaud
+# 2019.
+#
+# For more information, feedback or questions, refer to our website:
+# https://paclido.fr/lilliput-ae
+#
+# To the extent possible under law, the implementer has waived all copyright
+# and related or neighboring rights to the source code in this file.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+"""Helper functions used in both Lilliput-I and Lilliput-II."""
+
+
from .constants import BLOCK_BITS, BLOCK_BYTES
from .helpers import xor
from . import tbc