[zaphar]

This is all sort of an argument about semantics. But the real heart of this argument is over who owns the tractor and whether it's acceptable for someone to limit what you can do with something they sell you.

Which is a "separate" question from whether the Government can limit what you can do with something you own. It's further clouded by the fact that you sign a contract when you buy it so you explicitely gave up some of your rights.