marketing purposes. (B) Annual report Each data broker registered under subsection (a) shall submit to the Commission, on an annual basis, a report on the completion rate with respect to the completion of deletion requests under subparagraph (A). (C) Audit (i) In general Not later than 3 years after the date of enactment of this section, and every 3 years thereafter, each data broker registered under subsection (a) shall undergo an independent third party audit to determine compliance with this subsection. (ii) Audit report Not later than 6 months after the completion of any audit under clause (i), each such data broker shall submit to the Commission any report produced as a result of the audit, along with any related materials. (iii) Maintain records Each such data broker shall maintain the materials described in clause (ii) for a period of not less than 6 years. (3) Annual fee (A) In general Subject to subparagraph (B), each data broker registered under subsection (a) and who maintains any persistent identifiers (as described in paragraph (1)(B)(iii)) shall pay to the Commission, on an annual basis, a subscription fee determined by the Commission to access the database. (B) Limit The amount of the subscription fee under subparagraph (A) may not exceed 1 percent of the expected annual cost of operating the centralized system and hashed registries described in paragraph (1), as determined by the Commission. (C) Availability Any amounts collected by the Commission pursuant to this paragraph shall be available without further appropriation to the Commission for the exclusive purpose of enforcing and administering this section, including the implementation and maintenance of such centralized system and hashed registries and the promotion of public awareness of the centralized system. (c) Enforcement by the Commission (1) Unfair or deceptive acts or practices A violation of subsection (a) or (b) or a regulation promulgated under this section shall be treated as a violation of a rule defining an unfair or deceptive