Data distribution system, sending device, receiving device, data distribution method, sending method, receiving method, recording medium on which data preparation program is recorded and recording medium on which data assembling program is recorded

摘要

The invention comprises a data dividing unit for dividing input data into a plurality of pieces, a divided data replicating unit for replicating divided data, an additional information embedding unit for embedding additional information into replicated data, an encrypting unit for encrypting the data embedded with the additional information, and a sending unit for sending the encrypted data by means of multicast communications, further comprises a decoding unit for decoding the encrypted data which is received, and an assembling unit for assembling the decoded data.