On Thursday, 22. January 2009, Jon S. Berndt wrote:

> Since it appears as though JSBSim will use the product identifiers
> (e.g..Boeing 737) in a descriptive manner, and no profit will be derived
> from said usage, then we have no objection to inclusion of the product
> identifiers on the software.  However, if a situation arises in which the
> aircraft models are to be sold for a profit, please contact us to discuss
> implementation of a Trademark License Agreement for the sale of consumer
> products.

Looks like a siple case to me: no copyright law involved, just trademark law. 
This should not be any problem for GPL'ed distribution. A very good example 
for this whould be the well known Mozilla Firefox browser. No one would argue 
that the software is free as it's MPL/GPL dual licensed. But they do not 
allow modified versions to use their trademark and call it Firefox. That's 
why it's called Iceweasel on Debian.

So Boeing is actually more permissive than the Mozilla Foundation as they 
allow the trademark to be used in any non-profit situation. If someone want's 
to sell FlightGear or such models, they have to ask Boeing for a trademark 
license agreement or simply remove the trademark's usage from the software 
(like Debian does).

So the way to go seems to be just to add a notice, that the model uses 
Boeing's trademark with clearance for any non-profit distribution while for 
other uses, the trademark's usage has to be removed or Boeing contacted.
Not an additional restriction of the software license, but of the trademark 
usage.

Stefan

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