Though a lawyer (like anyone else) may owe duties of confidentiality to non-clients, that is not the ordinary situation. Lawyers daily or hourly receive information which they are not obliged to keep confidential, on behalf of the person giving the information. Whether they are so obliged depends upon where the information comes from, and under what circumstances. One of those circumstances is the relationship between the parties. Usually a lawyer has but one client, and information which the lawyer gathers from non-clients is held for the lawyer’s client alone, not for the informants. As noted in Part B, the presumptions in Martin v. MacDonald apply only to information from the lawyer’s client.
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