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(3) COMMUNICATION WITH USERS.—Except as provided under paragraph (2)(A)(iv), an entity taking an action described in this subsection shall determine the means to communicate such action to the entity’s users or customers.

(4) ENFORCEMENT OF ORDERS.—

• (A) IN GENERAL.—To ensure compliance with orders issued pursuant to this section, the Attorney General may bring an action for injunctive relief—
  • (i) against any entity served under paragraph (1) that knowingly and willfully fails to comply with the requirements of this subsection to compel such entity to comply with such requirements; or
  • (ii) against any entity that knowingly and willfully provides or offers to provide a product or service designed or marketed for the circumvention or bypassing of measures described in paragraph (2) and taken in response to a court order issued pursuant to this subsection, to enjoin such entity from interfering with the order by continuing to provide or offer to provide such product or service.

• (B) RULE OF CONSTRUCTION.—The authority granted the Attorney General under subparagraph (A)(i) shall be the sole legal remedy to enforce the obligations under this section of any entity described in paragraph (2).

• (C) DEFENSE.—A defendant in an action under subparagraph (A)(i) may establish an affirmative defense by showing that the defendant does not have the technical means to comply with this subsection without incurring an unreasonable economic burden, or that the order is not authorized by this subsection. Such showing shall not be presumed to be a complete defense but shall serve as a defense only for those measures for which a technical limitation on compliance is demonstrated or for such portions of the order as are demonstrated to be unauthorized by this subsection.

• (D) DEFINITION.—For purposes of this paragraph, a product or service designed or marketed for the circumvention or bypassing of measures described in paragraph (2) and taken in response to a court order issued pursuant to this subsection includes a product or service that is designed or marketed to enable a domain name described in such an order—
  • (i) to resolve to that domain name’s Internet protocol address notwithstanding the measures taken by a service provider under paragraph (2) to prevent such resolution; or
  • (ii) to resolve to a different domain name or Internet Protocol address that the provider of the product or service knows, reasonably should know, or reasonably believes is used by an Internet site offering substantially similar infringing activities as those with which the infringing foreign site, or portion thereof, subject to a court order under this section was associated.