When he uses parts of JSBSim, then I assume the license is compatible with the GPL. This means, it should be possible to use DFM data, aircraft models, textures and probably scenery rendering algorithms from glHorizon.
Right ?
Not really.
When he uses JSBSim he should make his changes to the code available, should sent the source code to every user who wants it (upon request, but he might ask a fee for it). The same counts for all JSBSim aircraft models he uses.
There is no relation between FDM configuration files and 3d models, textures and scenery rendering algorithms provided he didn't use any of that from another GPL'ed program (like FlightGear).
Erik
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