Okla. Stat. tit. 14A, § 14A-2-407: Security in sales or leases

(1) With respect to a consumer credit sale, a seller may take a

security interest in the property sold. In addition, a seller may

take a security interest in goods upon which services are performed

or in which goods sold are installed or to which they are annexed,

or in land to which the goods are affixed or which is maintained,

repaired or improved as a result of the sale of the goods or

services, if in the case of a security interest in land the debt

secured is One Thousand Dollars ($1,000.00) or more, or, in the case

of a security interest in goods the debt secured is Two Hundred

Dollars ($200.00) or more. Except as provided with respect to

cross-collateral (Section 2-408), a seller may not otherwise take a

security interest in property of the buyer to secure the debt

arising from a consumer credit sale.

(2) With respect to a consumer lease, a lessor may not take a

security interest in property of the lessee to secure the debt

arising from the lease.

(3) A security interest taken in violation of this section is

void.

(4) "Security interest" as used in this section means a

security interest arising by agreement of the parties and does not

include a lien arising by operation of law.