Okla. Stat. tit. 21 § 548
Any person who buys or sells, or in any manner procures, or makes or takes any promise or covenant to convey any pretended right or title to any lands or tenements, unless the grantor thereof, or the person making such promise or covenant has been in possession, or he and those by whom he claims have been in possession of the same, or of the reversion and remainder thereof, or have taken the rents and profits thereof for the space of one (1) year before such grant, conveyance, sale promise, or covenant made, is guilty of a misdemeanor. Provided, however, that the provisions of this Section shall not be construed to be a restriction or limitation upon the sale of Indian lands by the allottees or the heirs of such allottees of their inherited interest in said lands.
Okla. Stat. tit. 21, § 548