189.1. No person prohibited from trading in securities of a reporting issuer by the effect of section 187 or 189 may use the privileged information in any other manner unless he is justified in believing that the information is generally known to the public. Thus, no such person may trade in options concerning the securities of the issuer. Nor may the person trade in the securities of another issuer, in options or in futures contracts concerning an index, once their market prices are likely to be influenced by the price fluctuations of the issuer’s securities.