diff --git a/DFDL/stylesheets/ExtractPcapngDataValues.xslt b/DFDL/stylesheets/ExtractPcapngDataValues.xslt
index 4e8d67703e792249baadbc3e6ccda5dba042ab64..7d3f61e3b95ef63f7aec78280342b2a86825158c 100644
--- a/DFDL/stylesheets/ExtractPcapngDataValues.xslt
+++ b/DFDL/stylesheets/ExtractPcapngDataValues.xslt
@@ -1,4 +1,38 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (c) 1995-2021 held by the author(s).  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * 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.
+    * Neither the names of the Naval Postgraduate School (NPS)
+      Modeling Virtual Environments and Simulation (MOVES) Institute
+      (https://www.nps.edu and https://my.nps.edu/web/moves)
+      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,
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+POSSIBILITY OF SUCH DAMAGE.
+-->
+
 <!--
     title       : ExtractPcapngValues.xslt
     created     : 3 September 2021