Is it legal to buy off manufacturers of generic equivalents?

The FTC thinks it's unlawful for the manufacturer of a patented drug or device to include in the settlement of its suit against the manufacturer of a generic equivalent a cash payment in return for the generic manufacturer's pledge to withhold its product from market. [In the Matter of Schering-Plough Corporation, Upsher-Smith Laboratories, and American Home Products Corporation, Docket No 9297]