“… for many years the SEC did not sufficiently address the ways in which Investment Company Act restrictions can be violated through the use of derivatives. The SEC’s basic approach to derivatives risk at funds was set out in a series of releases and no-action letters between 1979 and the late 1980s. The fundamental approach adopted at that time was based on ‘offsetting’ or ‘coverage’ – that is, if a fund segregates assets deemed sufficient to ‘cover’ a derivatives risk, or an offsetting derivatives exposure, then derivatives usage would not violate ’40 Act limitations.”