A process and system for activating various programs are provided in a personal computer. The computer is initially provided with a registration shell. A data link is established between the personal computer and a registration computer. By providing the registration computer with various information,...http://www.google.com.hk/patents/US5222134?utm_source=gb-gplus-share專利 US5222134 - Secure system for activating personal computer software at remote locations
