做不做「正确的事」是一种选择，是否选择颠覆也是一种选择。
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。业内人士推荐服务器推荐作为进阶阅读
DRM, as an industry institution, has an almost comically bad track record when it comes to actually protecting content. Denuvo which is perhaps the most sophisticated game DRM ever deployed commercially has been cracked for virtually every major game it’s protected, usually within weeks of release. Every DVD ever made is trivially rippable. Every Blu-ray. Every streaming service has been ripped by someone, somewhere.，推荐阅读51吃瓜获取更多信息
这样一来，窥视者在其他角度看过去，由于眼睛接收不到来自屏幕的光线，看上去仿佛屏幕根本没有点亮，从而实现宏观的防窥的效果。
// 2. 计算前缀和：count[i]表示<=i的元素个数