如果用户上载了大量同样的文件，罗布森的MP3tunes系统会删除重复数据，罗布斯认为，因为这种技术实现的细节而断言他的公司违法将是非常荒谬的。
Robertson—whose MP3tunes service deletes redundant copies if multiple users upload the same file—claims it would be preposterous to hold his company liable over this implementation detail.
一些 IT 专业人士认为，重复数据删除和单实例存储（SIS）是一回事，但其实并非如此。
Some IT professionals think that deduplication and Single Instance Store (SIS) are the same thing, but they are not.
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