to negotiations and agreements between and among copyright owners and persons entitled to obtain a compulsory license for covered activities under this subsection, and common agents acting on their behalf, including with respect to the administrative assessment established under this subsection. (B) Limitation on common agent exemption Notwithstanding the antitrust exemption provided in subsection (c)(3)(B) and subparagraph (A), except for the administrative assessment, neither the mechanical licensing collective nor the digital licensee coordinator shall serve as a common agent with respect to the establishment of royalty rates or terms under this section. (C) Antitrust exemption for administrative activities Notwithstanding any provision of the antitrust laws, copyright owners and persons entitled to obtain a compulsory license under this section may designate the mechanical licensing collective to administer voluntary licenses for the reproduction or distribution of musical works in covered activities on their behalf