A platform must block access from sanctioned jurisdictions and restrict content by market. How is this implemented and where does it fail?

The two different requirements

Sanctions compliance is a legal obligation with serious consequences and requires reasonable effort against deliberate evasion. Content licensing restriction is a contractual obligation where a best-effort control is generally what was agreed. Conflating them leads to over-engineering one and under-engineering the other.

The implementation

• IP geolocation at the edge, blocking before the request reaches application infrastructure. Fast and imperfect — databases lag reality, and mobile and corporate networks misattribute.
• Screening against sanctions lists at account creation and transaction time, since the legal obligation attaches to the party, not to their network location. This is the control that matters most for sanctions and it is not a network control at all.
• Payment instrument and billing address checks, which are stronger signals of the party's actual location than an IP address.
• Ongoing rescreening, because lists change and an account compliant at creation may not remain so.
• Blocking logged with evidence, since demonstrating the control operated is what an examination requires.

Where it fails

• VPN and proxy use, which defeats IP-based controls entirely — which is why sanctions compliance cannot rest on geolocation.
• Stale geolocation data, producing both false blocks and misses.
• Controls at the edge only, with API endpoints or partner integrations unprotected.
• Name-matching false positives, which are numerous with common names and need a review workflow rather than automatic blocking.

The design principle

Layer the controls and match the strength to the obligation. Network-level blocking handles volume cheaply; identity and payment screening handles the legal obligation; and the evidence trail is what demonstrates reasonable effort — which is the standard actually applied, since perfect prevention is not achievable and is not what is required.