应用程序安全性:独立于系统日历的计数天数

问题描述

我想向我的应用程序试用版添加功能.首次激活后，我希望将其限制为90天.但是我担心用户更改系统日期，从而欺骗了我的应用程序.
是否有可能以一种即使在用户将压光机取回后，应用程序在首次激活90天后即失效的方式来实现简单的证明呢?首次激活日期已保存在数据库中.

非常感谢.
Furqan

Hi,
I want to add a feature to my trial version of the application. After first activation, I want to make it limited to 90 days. But I am concerned about user''s changing the date of system hence deceiving my application.
Is there any possibility to make it fool proof in a way that even if user takes the calender back, application expires after 90 days of first activation? First activation date has been saved in the database.

Thank you very much.
Furqan

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