Del. Code Ann. tit. 24, § 2934
(a) Commencement of duties for a statutory agent. — The duties of confidentiality as required by § 2936(c) of this title begin upon first contact between a licensee and the customer. The other statutory duties between a licensee and client as required by this subchapter begin upon the earlier of:
unless a CIS is signed indicating there is no agency relationship. For transactions exempt from providing the CIS, the duties of the agent commence when the parties form an agency relationship.
(b) Duties of a statutory agent after termination. — A licensee and brokerage organization owe no further duty or obligation to the customer or client after termination, expiration, completion or performance of the transaction or other termination of the brokerage relationship, except the duties of:
(2) Treating as confidential the information provided by the customer or client during the course of the relationship that may reasonably be expected to have a negative impact on the customer or client’s real estate activity unless:
75 Del. Laws, c. 277, § 6; 76 Del. Laws, c. 258, § 3; 78 Del. Laws, c. 166, § 1