<![CDATA[Policy Agents]]>In a dataspace, policies define who may use which data, for what purpose, and under which obligations. Policies are part of contract offers and agreements, not optional extras. A policy agent (policy decision point) evaluates requests against rules and returns allow/deny before data leaves the provider.

Eclipse Dataspace Components use a policy engine on the control plane to attach constraints to assets and contract definitions. During negotiation, both sides must agree on compatible policies before contract finalization and data transfer. ODRL-based expressions are common for machine-readable rights: ODRL model (W3C).

For API-level runtime authorization (for example SPARQL endpoints), MAT-X can use Open Policy Agent (OPA) with Rego policies. OPA evaluates request attributes (method, path, bearer token, etc.) and keeps policy logic separate from application logic.

Further reading

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