[farginay]

If that's all they were concerned with they could just use GPS readings to invalidate the service agreement rather than switching the machine off.

In any case, I wish that Congress would step up and put law around the issue of whether one can "sell" things with restricted use. E-books, for instance, are really leased rather than sold. A sane legal system would give teeth to that legal distinction.

[DennisP]

In this case they're claiming that Congress required them to restrict the use.