The prototype of many Lockheed planes is being sold all over the world. What is added, removed, modified etc is what makes it different. I know of several countries who own the F16 but it is modified. The government bought their version of modifications like the other countries bought theirs.

The prototype is still copyrighted, patented and tradmarked by Lockheed. After all the work that they put into that prototype they have every right to copyright and patent it and if they choose to, to go after anyone who should not be copying it.  No different than any of the merchants in Poser  or other 3D apps who spend months on their models.  No one can "legally" copy those either. The only difference is companies like Lockheed and Boeing have the money to protect their interests. Maybe that's the raw nerve here

In a world filled with causes for worry and anxiety...
we need the peace of God standing guard over our hearts and minds.
 
Jerry McCant