were not talking about commercially produced vehicles. this is geared toward WW2 fighters and modern jet fighters, actually stemmed over the FA-18 hornet when Lockheed saw people are getting 20 grand for a model regardless of air frame being a small fraction of that. most of this kinda of intellectual property is owned by the government. So the companies like Lockheed are coming back with public designs and demanding royalties for them, now the modern equipment like the f-18 Lockheed still has the rights to, but planes like mustangs, sea Fury's and p-38, the old stuff are owned but government agencies. Were not copying the flight control systems and software packages which are pieces that are still privately owed. The government is pretty screwy but it not legal for them to demand royalties which they are not.