A security system for freight containers comprises: a locking device configured to reliably attach to the container and prevent unauthorized opening of the container doors; an electromechanical locking mechanism; and a GPS receiver so that unlocking may be authorized when the container is at a selected...http://www.google.de/patents/US20090135015?utm_source=gb-gplus-sharePatent US20090135015 - Locking apparatus for shipping containers
