> Maybe a better question is, why don't all the auto companies, which already cooperate and "collude" on a lot of things, have similar licenses? They do. The d

> Maybe a better question is, why don't all the auto companies, which already cooperate and "collude" on a lot of things, have similar licenses? They do. The difference is that farmers are far more likely to attempt a fix on their machine than the average car user. Also, since farmers use their tractors more than the average user uses their car, a tractor is part of a system, while a car typically is the system. As such, there are a lot of parts to integrate with and as a result, more places where the system can break.