(f) An Internet service provider does not violate, and does not aid and abet a violation of subdivision (a), and subdivision (a) shall not be enforced against an Internet service provider, to the extent that the Internet service provider enables a user of its service to electronically disseminate an audiovisual work or sound recording, if the Internet service provider maintains its valid e-mail address or other means of electronic notification on its Internet Web site in a location that is accessible to the public. For the purposes of this section, "Internet service provider" means an entity, to the extent that the entity is transmitting, routing, or providing connections for Internet communications initiated by or at the direction of another person, between or among points specified by a user, of material placed online by a user, storing or hosting that material at the direction of a user, or referring or linking users to that material.