S.C. Code Ann. § 36-9-207
(b) Except as otherwise provided in subsection (d), if a secured party has possession of collateral:
(4) the secured party may use or operate the collateral:
(c) Except as otherwise provided in subsection (d), a secured party having possession of collateral or control of collateral under Section 36-9-104, 36-9-105 , 36-9-106, or 36-9-107:
(d) If the secured party is a buyer of accounts, chattel paper, payment intangibles, or promissory notes or a consignor:
(1) subsection (a) does not apply unless the secured party is entitled under an agreement: