Entitlement is the service that decides, for each viewer, exactly what they are allowed to watch right now. It is the hard part of billing: payment tells you someone paid, but entitlement answers the precise, real-time question at the moment of play — does this account, on this device, in this country, with this plan, have the right to start this specific title at this instant?
Entitlement sits between billing/identity and playback. It resolves subscriptions and their tiers, active rentals and their windows, geo-rights and content windowing, device limits and concurrent-stream caps, parental controls, and promotions — then issues a yes/no (and the parameters) that the paywall, the manifest service, and the DRM license server all enforce. The DRM license is often the ultimate enforcement: no entitlement, no key.
Because it is consulted on every play and must be correct, fast, and consistent across web, mobile, and TV, entitlement is one of the trickiest backend systems in OTT — small bugs here mean either revenue leakage or angry paying customers locked out of content.
