Apple is employing a “rent once, watch anywhere” approach to movie rentals in the iTunes Store. The latest iTunes 12.6 update for the desktop will no longer restrict you to watch a movie you rented on the iPhone, iPad, Apple TV, or PC you rented it on. This feature will be available to work on devices with iOS 10.3 or tvOS 10.2. These haven’t been officially released to the public yet but with this update, we won’t be surprised if the rollout is soon.
Source: The Verge