After discussing many data copy distribution modes, an optimized data copy distribution is proved in this paper.

对不同数据副本分布方式进行探讨，同时，论证了最优副本分布方案。

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While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

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But there is a clear side-effect: the illicit distribution of multimedia data and very easy to copy, but the quality is not jeopardized.

但有一个明显的副作用：多媒体数据的非法传播和拷贝非常容易，而且质量不受损害。

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