The correct choice is Turn on the "Block suggestions matching public code" setting in GitHub Copilot. This feature reduces the likelihood that suggestions mirror code from public repositories and it can be enforced at the organization or enterprise level so it satisfies the team’s requirement to apply the policy across their environment.

When enabled, the public code matching control filters out suggestions that are too similar to known public code. Administrators can enforce this as a policy for all members of an organization which ensures consistent behavior for every developer using Copilot.

Set a similarity threshold value in GitHub Copilot duplicate detection to tune how closely suggestions can match public code is not a Copilot feature. Copilot does not expose a numeric similarity threshold for you to tune and the supported control is the public code matching block.

Enable Cloud DLP in your GCP project to prevent Copilot from proposing code that resembles public repositories is unrelated to GitHub Copilot settings. Cloud DLP does not control Copilot’s code generation behavior in GitHub.

From the GitHub.com UI go to Settings for GitHub Copilot and enable Safe Mode for duplicates is not a real Copilot setting. There is no Safe Mode for duplicates in Copilot and the correct mechanism is the public code matching block.

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