OpenJUMP Licensing
OpenJUMP (OJ) and the used software components distributed are licensed as follows. For more recent informations about licensing read the readme.txt file of the OJ distribution you are using.
OpenJUMP Core & Plugins/Extensions
OpenJUMP is distributed under the GPL2 license. A description of this license can be found in the "gpl2_license.txt" file in the "licenses" folder or on http://www.gnu.org/licenses/gpl-2.0.html .
Used libraries
Regarding the multitude of libraries that are included in the OpenJUMP distributions (currently CORE and PLUS) please refer to the chapter LICENSING in
http://jump-pilot.sourceforge.net/svn/core/trunk/etc/readme.txt
as the most current source for information on this topic.
ErMapper ECW/JP2 SDK libraries
Proprietary ECW libraries (as distributed in the PLUS edition) are a quite confusing issue and therefore deserve a special mention here.
Until version 3.3 the ErMapper SDK used to have a triple licensing policy described here.
Later versions restricted the license so much that a use and distribution in open source software is either not possible or bound to very strict conditions. Erdas website now invite SDK user to acquire a license through the following form.
OpenJUMP uses libraries based on the version 3.3 of the ErMapper ECW JPEG 2000 SDK. The binaries and sources were actually taken form the gvSIG project. As GPL2'd software it uses these under the "ECW JPEG 2000 SDK PUBLIC USE LICENSE AGREEMENT"
Use of the ECW JPEG 2000 SDK with Unlimited Decompressing and Unlimited Compression
for applications licensed under a GNU General Public style license ("GPL") is governed
by the "ECW JPEG 2000 SDK PUBLIC USE LICENSE AGREEMENT"
Find the full license text here.
The OJ developers had some extensive discussions about the ECW licensing which can be read here :
http://www.mail-archive.com/jump-pilot-devel@lists.sourceforge.net/msg09231.html and http://www.mail-archive.com/jump-pilot-devel@lists.sourceforge.net/msg09358.html
Other resources about ecw licensing issue are :