Ory is pioneering the development of an open-source implementation of Google's Zanzibar authorization system called Ory Keto, addressing the intricate problem of authorization in critical global systems. This system processes billions of permission checks across different environments swiftly and consistently, leveraging a uniform data model and configuration language for access control policies. Zanzibar, originally codenamed "Spice," is designed for low latency, large scale, and high availability, supporting trillions of access control lists and millions of requests per second. Ory Keto builds on this by offering a flexible data model to cater to various applications with different access control patterns and ensuring strong consistency through version snapshot tokens. Although snaptokens are not yet implemented, the groundwork for their integration is laid out, promising eventual consistency guarantees. The system is part of Ory's broader platform, which aims to enhance zero trust security by providing essential services like identity management and access control in a scalable, low latency cloud infrastructure.