VOD is a multimedia service that enables participants to select and play videos (such as feature films, training modules or music clips) from a set of videos that are on offer. Content is stored in compressed form in interconnected video servers and is usually transferred over a broadband network (Internet) and viewed on a TV or some other suitable device. In the TV market, VOD is often offered as a “pay-per-view” (PPV) or a subscription-based service (payment on a time-related contractual basis).