Production Licences are frankly not needed in HoI IV. In HoI III the minors had a major disadvantage to the majors and basicly no way to really be able to do remotely as much research let alone production as a major. In HoI IV majors buying your resources will result in you being able to build up your industry much faster and also you have research slots, of which minors may get one or two less than majors, but you wont lack behind that massively. Minors are no longer something majors can simply kick around. Alone you might not be able to withstand germany as romania for example, but if you form a faction with the balkans you may become a force to be reckoned with. They simply arent really needed in HoI IV, since you can quiet easiely research the stuff yourself.
On top of that production licenses are nothing more than a major source for exploits, where each nation simply focuses on one single thing. All they'd do is b-lining one aspect, like fighters and even research them ahead of time and give a license to the other players in the faction. That basicly destroys the whole gameplay. It would be extremely weird to see germany building some Yamatos in kiel for example.