A system for permitting only an authentic user to play a desired application contained in a distributed application package in one of predetermined operation, e.g., free play mode, charged mode, limit-attached play mode, etc. The system comprises a client for playing an application under the control...http://www.google.com/patents/US6470085?utm_source=gb-gplus-sharePatent US6470085 - Application package and system for permitting a user to use distributed application package on the term of the use thereof
