Experiments are not permitted under this subpart and a conventional experimental radio license is required when:

(a) An environmental assessment must be filed with the Commission as required by §5.63(a), or

(b) An orbital debris mitigation plan must be filed with the Commission as required by §5.64, or

(c) The applicant requires non-disclosure of proprietary information as part of its justification for its license application; or

(d) A product development or a market trial is to be conducted.