; (II) significant nonblanket licensees; and (III) authorized vendors of the entities described in subclauses (I) and (II). (vi) Additional requirements The Register of Copyrights shall establish requirements by regulations to ensure the usability, interoperability, and usage restrictions of the musical works database. (F) Notices of license and nonblanket activity (i) In general The mechanical licensing collective shall receive, review, and confirm or reject notices of license from digital music providers, as provided in subsection (d)(2)(A). The collective shall maintain a current, publicly accessible list of blanket licenses obtained by digital music providers under this subsection that includes contact information for the licensees and the effective dates of such licenses. (ii) Public list of notices The mechanical licensing collective shall receive notices of nonblanket activity from significant nonblanket licensees, as provided in subsection (d)(6)(A). The collective shall maintain a current, publicly accessible list of notices of nonblanket activity submitted by significant nonblanket licensees that includes contact information for such licensees and the dates of receipt of such notices. (G) Collection and distribution of royalties (i) In general Upon receiving reports of usage and payments of royalties from digital music providers for covered activities, the mechanical licensing collective shall— (I) engage in efforts to— (aa) identify the musical works embodied in sound recordings reflected in such reports, and the copyright owners of such musical works (and shares thereof); (bb) confirm uses of musical works subject to voluntary and individual download licenses, and the corresponding pro rata amounts to be deducted from royalties that would otherwise be due under the blanket license; and (cc) confirm proper payment of royalties due