Add note about software license grant from BEA Systems back in 2003

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1901977 13f79535-47bb-0310-9956-ffa450edef68

legal/NOTICE

@@ -9,6 +9,8 @@ Copyright (c) 2000-2003, BEA Systems, <http://www.bea.com/> (dead link),
 which was acquired by Oracle Corporation in 2008.
 <http://www.oracle.com/us/corporate/Acquisitions/bea/index.html>
 <https://en.wikipedia.org/wiki/BEA_Systems>
+Note: The ASF Secretary has on hand a Software Grant Agreement (SGA) from
+BEA Systems, Inc. dated 9 Sep 2003 for XMLBeans signed by their EVP/CFO.
 
 This product contains W3C XML Schema documents. Copyright 2001-2003 (c)
 World Wide Web Consortium (Massachusetts Institute of Technology, European