If the sale of a security entitles the purchaser or subsequent holder to exchange that security for another, or to purchase another security, the sale of, including an exchange for, the other security may not be made unless the sale is authorized under this title, if not exempt under this title, or by another provision of law. (V.A.C.S. Art. 581-4, Subsec. E (part).)
Tex. Gov't. Code § 4003.151