Mac cloner Psystar has announced a new OEM licensing program, designed to spread the company's virtualization software. Subscribers to the program gain access to the company's Darwin Universal Boot Loader (DUBL), which allows users to install Mac OS X on a PC, instead of just an Apple-branded Mac. Users can in fact have up to six operating systems on a computer, but hardware certified by Psystar must at least have Linux, Windows Vista or Windows 7 pre-installed.