S.C. Code § 60-4-10
Records related to registration and circulation of library materials which contain names or other personally identifying details regarding the users of public, private, school, college, technical college, university, and state institutional libraries and library systems, supported in whole or in part by public funds or expending public funds, are confidential information.
Records which by themselves or when examined with other public records would reveal the identity of the library patron checking out or requesting an item from the library or using other library services are confidential information.
The confidential records do not include nonidentifying administrative and statistical reports of registration and circulation.
The confidential records may not be disclosed except to persons acting within the scope of their duties in the administration of the library or library system or persons authorized by the library patron to inspect his records, or in accordance with proper judicial order upon a finding that the disclosure of the records is necessary to protect public safety, to prosecute a crime, or upon showing of good cause before the presiding Judge in a civil matter.
S.C. Code § 60-4-10