A system and method for limiting access to and preventing unauthorized use of an owner's digital content stored in an information network and available to clients under authorized conditions. The network includes at least one server coupled to a storage device for storing the limited access digital content...http://www.google.com.hk/patents/US6098056?utm_source=gb-gplus-share專利 US6098056 - System and method for controlling access rights to and security of digital content in a distributed information system, e.g., Internet
