[PythonDeveloper]

They own "a" right, not "the rights". At any rate, it means that they can implement any submitted idea without compensation or award to any person.

The idiocy with this agreement is that it says "fully paid", and without any renumeration actually getting paid to you, that test fails. Irrespective of that idiocy, even if "fully paid" is struck, it's irrevocable, so you could find yourself losing AND in a lawsuit with Nissan over the priority of rights, yours versus theirs.

[mtdev]

You are correct in your first sentence, I am not a lawyer but interpreted the agreement as they are able to use/sell your idea or any modification of your idea while you still technically own your idea.