如何防止一本书通过限制IP下载？
我想限制未购买数字图书的人下载该图书。有办法做到吗？
当用户购买这本书时，系统会向他发送一个可以下载该书的链接，但他是唯一可以阅读该书但无法共享该书的人。很可能，只有他的IP才允许阅读这本书。
I would like to restrict from being downloaded a digital book by someone who did not buy it. Is there a way to do it?
When the user buys the book, it is sent to him a link from where he can download it, but he is the only person that can read it and can´t share it. Likely, only his IP is allowed to read this book.
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