U.S. SEC Rule 10b5-1 clarified that the prohibition against insider trading does not require proof that an insider actually used material nonpublic information when conducting a trade; possession of such information alone is sufficient to violate the provision, and the SEC would infer that an insider in possession of material nonpublic information used this information when conducting a trade. However, SEC Rule 10b5-1 also created for insiders an affirmative defense if the insider can demonstrate that the trades conducted on behalf of the insider were conducted as part of a pre-existing contract or written binding plan for trading in the future.[15]