S.D. Codified Laws § 37-6-27 (2026)
Nothing in §§ 37-6-4 to 37-6-26, inclusive, shall adversely affect the right or the enforcement of rights in marks acquired in good faith at any time at common law.
Source: SL 1955, ch 232 , § 13; SDC Supp 1960, § 51.0913; SL 1980, ch 264 , § 20.