Computer software can be secured so that it only operates on a customer system that has a protection file that is unique to the system. The software is inoperable when copied to other systems, even though the protection file is copied as well. The protection file is sufficiently encoded so that attempts...http://www.google.fr/patents/US6587842?utm_source=gb-gplus-shareBrevet US6587842 - Software-based protection system for software products distributed on copyable media, or downloaded over a communications link
Software-based protection system for software products distributed on ...
