There is however a business trick to go around this "limitation" of copyright, and that is by using a "server" which the car will call home to (like once a week/month/year), or simply accessing data from on a regular basis. By restricting "access to the server", Tesla can impose any limit they want including restriction on the after market. Owners would also not be allowed to fix their own car to skip the check or talk to a third-party server as that would go against the DMCA anti-circumvention (which is part of US copyright law).