Apache POI Copyright 2001-2007 The Apache Software Foundation This product includes software developed by The Apache Software Foundation (http://www.apache.org/). Unit testing support is provided by JUnit, under the Common Public License Version 1.0: http://www.opensource.org/licenses/cpl.php See http://www.junit.org/ A single data file of the POI component HDGF is based on VSDump, and is under the GNU General Public Licence version 3 (GPL v3): http://gplv3.fsf.org/ Since this is a data file, and has no compiled version (the original file is distributed in both source and binary versions), there should be little difference in licencing requirements compared to the ASL. See http://www.gnome.ru/projects/vsdump_en.html Office Open XML experimental support: XML Beans - http://xmlbeans.apache.org/ Apache Licence Version 2.0 - http://www.apache.org/licenses/LICENSE-2.0 DOM4J - http://www.dom4j.org/ BSD Licence - http://www.dom4j.org/license.html Jaxen - http://jaxen.org/ Apache Style Licence - http://jaxen.org/license.html OpenXml4J - http://www.openxml4j.org/ BSD Licence or Apache Licence Version 2.0 - http://www.openxml4j.org/Licensing/Default.html Office Open XML ECMA Specification - http://www.ecma-international.org/publications/standards/Ecma-376.htm Microsoft Open Specification Promise (OSP) - http://www.microsoft.com/interop/osp/