S.C. Code Ann. § 40-57-137
(A) A real estate brokerage company that provides services through an agency agreement for a client is bound by the duties of loyalty, obedience, disclosure, confidentiality, reasonable care, diligence, and accounting as set forth in this chapter. The following are the permissible agency relationships a licensee may establish:
(B) The broker-in-charge of a real estate brokerage company shall adopt a written company policy that identifies and describes the types of real estate brokerage agency relationships in which associated licensees may engage. The written policy shall include:
(C) On reaching a written agreement to provide brokerage services for a seller of real estate, a seller's agent shall:
(2) in accordance with subsection (A), promote the interest of the seller by performing agency duties which include:
(6) preserve confidential information provided by the seller during the course of and following the agency relationship that might have a negative impact on the seller's real estate activity unless:
(c) disclosure is necessary to defend the licensee against an accusation of wrongful conduct in a proceeding before the commission or before a professional association or professional standards committee.
No cause of action may arise against a licensee for disclosing confidential information in compliance with subsection (C)(6)(a), (b), or (c).
(H) On reaching a written agreement to provide brokerage services to a potential buyer of real estate, a buyer's agent shall:
(2) in accordance with subsection (A), promote the interest of the buyer by performing the buyer's agent's duties which include:
(6) preserving confidential information provided by the buyer during the course of or following the agency relationship that might have a negative impact on the buyer's real estate activity unless:
(c) disclosure is necessary to defend the licensee against an accusation of wrongful conduct in a proceeding before the commission or before a professional association or professional standards committee.
No cause of action may arise against a licensee for disclosing confidential information in compliance with subsections (H)(6)(a), (b), or (c).
(M) A licensee may act as a disclosed dual agent only with the prior informed and written consent of all parties. Consent is presumed to be informed if a party signs a completed copy of the agency disclosure form prescribed by the commission. The form shall specify the transaction in which a licensee shall serve as dual agent and shall state:
(2) that the dual agent may disclose any information gained from one party to another party if the information is relevant to the transaction, except if the information concerns:
(O) Prospective buyers of real estate who do not choose to establish an agency relationship with a licensee but who use the services of the licensee are considered customers and shall receive the following: