“Since I have come to the conclusion that the defendants' assertion that they have never made or issued to the public illicit copies of Microsoft operating system software is simply not credible, this evidence suggests that infringement must have been committed knowingly. In any event, all PCs need operating system software to operate. If, as I have held, the defendants have infringed the plaintiff's copyright by making illicit copies of its operating system software, that is not because the defendants are interested in copying a particular version of that software, such as MS-DOS 6.22, but because they have decided to copy whatever operating system is currently saleable. This constitutes a general threat to infringe the copyright in this class of software. Therefore I have come to the conclusion that Microsoft is entitled to injunctions in the form set out above but limited to operating system computer software.”