A registration system allows digital data or software to run in a use mode on a platform if and only if an appropriate licensing procedure has been followed. Preferably, the system detects when part of the platform on which the digital data has been loaded has changed in part or in entirety, as compared...http://www.google.co.uk/patents/US5490216?utm_source=gb-gplus-sharePatent US5490216 - System for software registration
