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Ron Burkey's Virtual AGC is published under the GNU General Public License. It's a integral part of Virtual Apollo, so Virtual Apollo has to be published under the GNU General Public License, too. So why is there a "Virtual Apollo License"?
The problem is Orbiter. Orbiter is free but not open source (and seems never to be) and Virtual Apollo is linked against Orbiter SDK libraries. This is why it's necessary to introduce a special exception as explained here: http://www.gnu.org/licenses/gpl-faq.html#GPLIncompatibleLibs.
Virtual Apollo is published under the following license. In order to run, install, download or otherwise make use of Virtual Apollo, you have to agree to this license:
| Virtual Apollo - An add-on for Orbiter (www.orbitersim.com) Copyright (C)
2004-2005 by the Virtual Apollo authors and contributors (see "Authors and contributors" in the project
documentation for a preliminary, still uncomplete list). This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA In addition, as a special exception, the Virtual Apollo authors and contributors give permission to link the code of this program with the Orbiter SDK (or with modified versions of the Orbiter SDK that use the same license as the Orbiter SDK), or with other libraries designed to work with the Orbiter SDK and/or Orbiter Program, including but not limited to the Orbiter Sound SDK, and distribute linked combinations of these. You must obey the GNU General Public License in all respects for all of the code used other than the Orbiter SDK and associated libraries. If you modify this file or document, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. |
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