diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..3ddc89d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+LICENCE
+=======
+
+Copyright 2017 The Zerocoin Electric Coin Company
+
+You may use this package under the GNU General Public License, version 2 or,
+at your option, any later version. You may use this package under the
+Transitive Grace Period Public Licence, version 1.0, or at your option, any
+later version. (You may choose to use this package under the terms of either
+licence, at your option.) See the file `COPYING.GPL`_ for the terms of the
+GNU General Public License, version 2. See the file `COPYING.TGPPL`_ for
+the terms of the Transitive Grace Period Public Licence, version 1.0.
+
+See `TGPPL.PDF`_ for why the TGPPL exists, graphically illustrated on three
+slides.
+
+.. _COPYING.GPL: https://github.com/tahoe-lafs/tahoe-lafs/blob/master/COPYING.GPL
+.. _COPYING.TGPPL: https://github.com/tahoe-lafs/tahoe-lafs/blob/master/COPYING.TGPPL.rst
+.. _TGPPL.PDF: https://tahoe-lafs.org/~zooko/tgppl.pdf
diff --git a/xcat/zcashRPC.py b/xcat/zcashRPC.py
index 7c7ebbb..2baefd9 100644
--- a/xcat/zcashRPC.py
+++ b/xcat/zcashRPC.py
@@ -1,8 +1,5 @@
 #!/usr/bin/env python3
 
-# Based on spend-p2sh-txout.py from python-bitcoinlib.
-# Copyright (C) 2017 The Zcash developers
-
 import sys
 if sys.version_info.major < 3:
     sys.stderr.write('Sorry, Python 3.x required by this example.\n')