<正>There are many video service websites(e.g.,iqiyi and youku)providing VIP services.In these video services,users can register for VIP by paying fare and then they can enjoy some special services in a certain time interval.We just define the video subscription as an aforementioned service.More and more users enjoy this form of video services and the number of the users is increasing all the time.Unfortunately,it is extremely easy for the video
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