| 摘要 |
There is provided a data distribution system having a distribution device for holding a data file which is a distribution object and a plurality of user terminals, wherein each of the user terminals obtains each of a plurality of file pieces from any of the other user terminals or the distribution device, the plurality of file pieces being obtained by dividing the data file, and the plurality of file pieces obtained are assembled to thereby obtain the data file, at least one predetermined file piece among the plurality of file pieces is a restricted piece for which obtaining from the other user terminals is restricted, and the distribution device restricts distribution of the restricted piece to each of the user terminals, based on a predetermined condition.
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