(b) In exceptional circumstances, an injunction may condition future use upon payment of a reasonable royalty for no longer than the period of time for which the use could have been prohibited. Exceptional circumstances include, but are not limited to, a material and prejudicial change of position prior to acquiring knowledge or reason to know of a misappropriation that renders a prohibitive injunction inequitable.
(c) In appropriate circumstances, affirmative acts to protect a trade secret may be compelled by court order.