Data distribution system

An objective of the present disclosure propose for a moulded to reduce, and operating) and multiple user device using the method for bandwidth requirement and ensure the end-user is a straight board of the magnetism choices moreover capable of the user download in a short - time. The target with large-tonnage product operating) and multiple comprises at least one of with a safe and memory unit user device and achieves; the system the link at least one group of user units are bidirectional, moreover operating centre comprises a memory in user device of suite a memory unit to the user unit device.