Apparatus, system and method for multicasting digital data, and program for implementing multicast delivery

摘要

A multicast controller capable of delivering moving image and music data, comprises delivery content announcing means 11 for announcing delivered contents, a reception fee, and a scheduled delivery start time to each of cells A, B; decryption key delivering means 12 for delivering a decryption key for decrypting encrypted data to reception wishing users; user number counting means 13 for counting the number of reception wishing users in each of cells A, B; delivery condition determining means 14 for determining whether or not each cell satisfies a previously set delivery condition; and data delivering means 15 for multicasting the moving image and music data to a cell which satisfies the delivery condition.