Concord Consortium Software License
All Concord Consortium software is Copyright © 1996-2012, The Concord Consortium, Inc. 25 Love Lane, Concord, MA 01742.
All of the software we write is distributed under one or more Open Source Initiative-approved licenses.
Most of our software is released under the GNU Lesser General Public License (LGPL) v2.1 or newer. Some of our software is released under the GNU General Public License (GPL) v2.0 or later and a few of our projects are licensed under one or more of the Simplified BSD, MIT, or Apache 2.0 licenses.
Summaries of the licenses
All of these licenses allow you to use software created by Concord Consortium and distributed to you. In addition you may make and distribute copies of this software. You also have the right to view and modify the source code for this software. If you distribute copies of our software you must include our copyright statement and license.
When our software is distributed under the LGPL or GPL licenses
If you modify our software and distribute it you are required to license your copyrighted modifications under a GPL or LGPL-compatible license and to make the entire source code for your derivation available to anybody you distribute the software to.
When our software is distributed under the LGPL license
You also have the right to link this software with other software with different licensing terms and distribute the combined software. In this case you must still license any derivations you have made of our software under an LGPL-compatible license.
When our software distributed is under the Simplified BSD, MIT, or Apache 2.0 licenses
You may modify and distribute our software under whatever license you choose as long as our copyright and licensing terms are included and followed.
Distributing our software under one or more of these open source licenses means that anyone can have access to the source code and make changes in it. We do this because open source is a strategy for long-term support of this software. All our work is grant-supported, so when the grant runs out, our ability to support the software ends. If a community of educators starts using this software, then it is in the interest of all members of the community to maintain and improve it. Like democracy, this is a risky strategy, but it seems to be better than any alternatives. Help us make it a success by using the software to help grow the community of educators dependent on this wonderful software.
