Okla. Stat. tit. 42, § 199
Nothing in this act shall be construed as in any manner impairing or affecting the light of parties to create liens by special contract or agreement, nor shall it in any manner affect or impair other liens arising at common law in equity, or by any statute of this state.
Laws 1998, HB 2983, c. 306, § 9, eff. November 1, 1998.