FlightGear

Use of GNU General Public License

While the original FlightGear is a free software, there has been some rebranding of old releases, which have been sold under other names; Flight Pro Sim, Pro Flight Simulator, Virtual Pilot 3D are some such commercial products.

These products do not mention the GNU license, and are not provided with FlightGear's source code, and are thus in breach of the license.

FlightGear's stance to these products can be seen here:

http://www.flightgear.org/flightprosim.html