bomber wrote:As it is up till now he's issued his work as GPL...
He does not have an alternative. He is not the sole author. As a matter of fact he is not even the author that began the shuttle.
The only way to switch the SpaceShuttle from GPL is that all previous authors agree. This means they could release an alternative shuttle with an alternative license, BUT NOT that they could revert previous GPL content,. and thus, it could only block future contributions, but it does not endanger hosting what already is GPL (and modify it as we want)
I don't see feasible that all authors of the shuttle come down now to agree on a non-GPL release.
And if so, depending on the level of restrictions (a.k.a if the new license allows redistribution), then it could still be housed in FGMEMBERS-NONGPL'
In other words, a move away of GPL means more easily -not on FGADDon- than -not on FGMEMBERS-
The only case of a FG plane I know of, the author has disallowed anything but copying and private usage is Vitos' MiG15.
As is, you won't find it anywhere.
[and yes, I repeatedly email Vitos asking him to consider a re-release to allow me to redistribute. His answer is no thanks, because I couldn't guarantee that sooner or later, FG would be taking the plane for only FG benefit. True fact, and that's that]