The correct option is Enable duplication detection to block suggestions that match public code. This setting suppresses suggestions that closely match public code in GitHub repositories when the snippet length crosses the relevant threshold and it helps reduce intellectual property risk at the organization or repository level.

This filter compares candidate completions against a large index of public code and blocks suggestions that are too similar, especially for longer snippets such as those over 180 characters. You can configure it centrally so teams receive fewer verbatim matches while still benefiting from generative assistance.

Require manual review of every Copilot suggestion before acceptance is not an available Copilot policy and it would not automatically prevent close matches to public code. Relying on manual checks is also impractical for day to day development.

GitHub Advanced Security provides code scanning, secret scanning, and dependency management features. It does not control Copilot suggestion filtering for matches to public code.

Enable Copilot license checking is not a real Copilot setting. Copilot does not perform license compliance checks on generated code and the way to reduce close matches is to use the public code matching filter.

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