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A reliable system uses several controls together. No single permission check is enough because access decisions can fail through incorrect metadata, stale user accounts, inherited folder permissions, or misconfigured integrations.

The practical answer is to build authorization into the entire data pipeline. Do not upload every company document into one unrestricted vector database and depend on the language model to decide what is safe.

It can search across many repositories only when every source retains its original permissions and retrieval applies the user’s authorization before returning content. A single unrestricted index is not a safe default for confidential information.