Geo-blocking restricts access to content based on the viewer's location, because streaming rights are usually licensed territory by territory. A title available in one country may be unavailable or owned by a different service in another, so the platform must enforce these boundaries.
Implementation combines IP geolocation, sometimes GPS or billing-address signals, and detection of evasion via VPNs and proxies. Geo-blocking is a contractual obligation, not an optional feature - failing to enforce it breaches licensing deals - and it interacts tightly with entitlement and content windowing, since 'where' and 'when' a title is available are both rights-driven constraints the platform must apply at playback.
