diff --git a/XMLSchema.py b/XMLSchema.py
index 41d5710..3687d36 100755
--- a/XMLSchema.py
+++ b/XMLSchema.py
@@ -1,3 +1,8 @@
+# Copyright (c) 2003, The Regents of the University of California,
+# through Lawrence Berkeley National Laboratory (subject to receipt of
+# any required approvals from the U.S. Dept. of Energy).  All rights
+# reserved. 
+#
 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
 #
 # This software is subject to the provisions of the Zope Public License,
diff --git a/license.txt b/license.txt
new file mode 100644
index 0000000..4f359ba
--- /dev/null
+++ b/license.txt
@@ -0,0 +1,44 @@
+*********
+
+ Copyright (c) 2003, The Regents of the University of California,
+ through Lawrence Berkeley National Laboratory (subject to receipt of
+ any required approvals from the U.S. Dept. of Energy).  All rights
+ reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+ (1) Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ (2) Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ (3) Neither the name of the University of California, Lawrence
+ Berkeley National Laboratory, U.S. Dept. of Energy nor the names of
+ its contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+ You are under no obligation whatsoever to provide any bug fixes,
+ patches, or upgrades to the features, functionality or performance of
+ the source code ("Enhancements") to anyone; however, if you choose to
+ make your Enhancements available either publicly, or directly to
+ Lawrence Berkeley National Laboratory, without imposing a separate
+ written license agreement for such Enhancements, then you hereby grant
+ the following license: a  non-exclusive, royalty-free perpetual
+ license to install, use, modify, prepare derivative works, incorporate
+ into other computer software, distribute, and sublicense such
+ enhancements or derivative works thereof, in binary and source code form.
+
+*********