In the US, barring other qualifiers, "classified" is a federal designation for national security data. Police are not federal. I could get more pedantic about i

In the US, barring other qualifiers, "classified" is a federal designation for national security data. Police are not federal. I could get more pedantic about it; there are designations like "Unclassified/Law Enforcement Sensitive" for data that can be shared with police. The police are allowed to keep various information internally. I'm not sure that license plate ownership information is protected at all, though, for this specific case.