如何让我的pdf只下载一次？ [英] How do I make my pdf downloadable only once?

问题描述

任何人都可以为我提供一个exe程序，使我的pdf文件只能下载一次吗？如果邮件由我的收件人转发，则不应该向第二人开放。

Can any one provide me with an exe program to make my pdf file downloadable only once? If the mail is forwarded by my recipient, it should not open to the second person.

推荐答案

一般来说，你不能。



如果您是通过电子邮件向某人发送链接并将该链接转发给其他人，则可以计算如果您控制服务器，则点击该链接的次数 - 链接所在的旁边代码并阻止第二次下载。



如果您在附件中发送PDF，则无法控制PDF的次数打开。



现在，你似乎没有考虑过另一个问题。如果PDF的初始下载失败并且用户必须再次重新下载PDF，该怎么办？如果他们失去了怎么办？



现在你的要求正在使用PDF来对付客户。

In general terms, you can't.

If you're sending the link to a person in an email and they forward that link to someone else, you can count how many times the link was clicked if you have control over the server-side code where the link goes to and prevent a second download there.

If you're sending the PDF in an attachment, you cannot control how many times the PDF is opened.

Now, another problem you seem to have not considered. What if the initial "download" of the PDF fails and the user has to re-download the PDF again? What if they lose it?

Now your "requirement" is working against the customer using the PDF.

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