[THJr]

There's a number of reasons, but as I understand the main issue is that John Deere is treating their tractor's firmware like the music industry was treating MP3's. They say farmers may own the tractor itself, and the hardware, but they're only licensing the use of the firmware and don't have the right to modify it. (Which can be necessary when repairing a tractor that has many computerized systems.)

They're essentially creating DRM for tractor software that's so restrictive that installing new parts requires access to secret codes in the firmware in order to turn them on, then accusing farmers of breaking the law if they try to alter or figure out these secret codes in order to keep their tractor working without going to a dealer. (According to my basic understanding, correct me if I'm wrong.)

[stingraycharles]

Playing the devil’s advocate: what’s preventing them from claiming the tractor itself as IP as well, and licensing it as such? Eg you’re not allowed to change your own tires. Would such a thing be legally possible, and if not, why does this differ from the firmware?

[ISL]

Deere could absolutely rent tractors to farmers -- it would be a different economic calculus. It is unclear what kind of pricing would entice farmers to rent rather than buy.

[SteveGerencser]

Most manufacturers already do this with fluids. You are required to use their oil and oil filters or you 'may' void the drivetrain warranty. We just bought a new tractor last spring and this is part of the new deal when it comes to purchasing a new tractor.