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>"Cedar falls somewhere between OPA with its datalog (prolog) based search approach and a Zanzibar based approach."

I understand the OPA from your description of it as a "datalog(prolog) based search approach" but you didn't characterize what the "Zanzibar based approach" is. Is there a similar short descriptive summary of its approach?

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Zanzibar is an authorization system Google built and describes in a paper [1], which uses relationships to make authorization decisions (aka ReBAC): if there exists a path of such relationships between a resource's permission and, say, a user, then the user is considered to have that permission on the resource. This structural approach to permission checking allows for high levels of scaling and low latency on checks.

Disclaimer: I am the cofounder of AuthZed, where we are building an open source version of Zanzibar known as SpiceDB [2]

[1] https://zanzibar.tech [2] https://github.com/authzed/spicedb

Is it spiced because the authorizations must flow?

Indeed it is! :)

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