15 U.S. Code § 6203 - Jurisdiction of district courts of United States
A person may not be compelled under an order issued under subsection (a) to give testimony or a statement, or to produce a document or other thing, in violation of any legally applicable right or privilege.
This section does not preclude a person in the United States from voluntarily giving testimony or a statement, or producing a document or other thing, in any manner acceptable to such person for use in an investigation by a foreign antitrust authority.
The Federal Rules of Civil Procedure, referred to in subsec. (b)(2)(C), are classified to Title 28, Appendix, Judiciary and Judicial Procedure.