UTV

　　1、URL Tag Validation

　　2、Special format of URL for preventing unauthorized usage and access

　　Original: http://www.baidu.com/2016/0704/8025915_HD-60i_7198.mp4

　　Using UTV:http://www.baidu.com/2016/0704/8025915_HD-60i_7198.mp4?px-time=1467685158&px-hash=a08a3c149514aae2aea14755a45a29c2

　　px-time : current time or expire time

　　px-hash : hash(secret + url_path +expire_time)

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原文地址：https://www.cnblogs.com/nopnog/p/7452405.html