47 CFR § 76.981 - Negative option billing.
(a) A cable operator shall not charge a subscriber for any service or equipment that the subscriber has not affirmatively requested by name. A subscriber's failure to refuse a cable operator's proposal to provide such service or equipment is not an affirmative request for service or equipment. A subscriber's affirmative request for service or equipment may be made orally or in writing.
(b) The requirements of paragraph (a) of this section shall not preclude the adjustment of rates to reflect inflation, cost of living and other external costs, the addition or deletion of a specific program from a service offering, the addition or deletion of specific channels from an existing tier or service, the restructuring or division of existing tiers of service, or the adjustment of rates as a result of the addition, deletion or substitution of channels pursuant to § 76.922, provided that such changes do not constitute a fundamental change in the nature of an existing service or tier of service and are otherwise consistent with applicable regulations.
(c) State and local governments may not enforce state and local consumer protection laws that conflict with or undermine paragraph (a) or (b) of this section or any other sections of this Subpart that were established pursuant to Section 3 of the 1992 Cable Act, 47 U.S.C. 543.