SDCL 57A-9-312

(a) A security interest in chattel paper, controllable accounts, controllable electronic records, controllable payment intangibles, instruments, investment property, or negotiable documents may be perfected by filing. (b) Except as otherwise provided in § 57A-9-315 (c) and (d) for proceeds: (1) A security interest in a deposit account may be perfected only by control under § 57A-9-314 ; (2) And except as otherwise provided in § 57A-9-308 (d), a security interest in a letter-of-credit right may be perfected only by control under § 57A-9-314 ; (3) A security interest in tangible money may be perfected only by the secured party's taking possession under § 57A-9-313 ; and (4) A security interest in electronic money may be perfected only by control under §