S.D. Codified Laws § 44-15-2

In the absence of any agreement to the contrary, the customer has all rights and title to any die, mold, form, or pattern in the possession of the manufacturer. If a customer does not claim possession from a manufacturer of a die, mold, form, or pattern within three years following the last use of the die, mold, form, or pattern, all rights and title to any die, mold, form, or pattern is transferred to the manufacturer for the purpose of destroying or otherwise disposing of the die, mold, form, or pattern.