Key derivation code: license/disclaimers

content/_code-samples/key-derivation/key-derivation.py

@@ -1,8 +1,18 @@
 #!/usr/bin/env python3
 
+################################################################################
 # XRPL Key Derivation Code
 # Author: rome@ripple.com
 # Copyright Ripple 2019
+# This sample code is provided as a reference for educational purposes. It is
+# not optimized for speed or for security. Use this code at your own risk and
+# exercise due caution before using it with real money or infrastructure.
+# This file is provided under the MIT license along with the rest of the
+# XRP Ledger Dev Portal docs and sample code:
+# https://github.com/ripple/xrpl-dev-portal/blob/master/LICENSE
+# Some of its dependencies are released under other licenses or are adapted
+# from public domain code. See their respective files for details.
+################################################################################
 
 import argparse
 import sys