Best just send him the resources he needs or get him to sign an NDA to cover you, so he only uses for private means. I wouldn't leave it to Googling unless the writer knows great GOV and EDU sources for tackling your subject matter. Many academic writers have access to the databases you use but if you know your data is accurate, and the dissertation needs it, don't gamble as this is your academic achievement. Get all the facts to the writer or ensure he can find them.
