By the late 1960s change was coming: as operating systems and programming language compilers evolved, software production costs were dramatically increasing relative to hardware. A growing software industry was competing with the hardware manufacturers' bundled software products (the cost of bundled products was included in the hardware cost), leased machines required software support while providing no revenue for software, and some customers, able to better meet their own needs, did not want the costs of manufacturer's software to be bundled with hardware product costs. In the "United States vs. IBM" antitrust suit, filed 17 January 1969, the U.S. government charged that bundled software was anticompetitive. While some software continued to come at no cost, there was a growing amount of software that was for sale only under restrictive licenses.