网站只给授权的人用，没授权的不能用，该怎么实现呢
网站只给授权的人用，没授权的不能用，该如何实现呢？
比如说公司做了一个网站，其他公司想买，公司希望别家公司买了就只有那一家能用。比如说a,b买了，那么a,b如果把程序给到c或d，但是没经过授权或给个什么key那么c,d就不能使用，请问要如何才能解决实现呢？
记得好像ecshop有这样的功能，但不知道实现方法。
@xuzuning 谢谢大神
------解决思路----------------------
简单点的就验证一下域名（不同的单位域名肯定是不同的）
复杂一点的就通过你们的网站验证一下
------解决思路----------------------
方法一用php扩展，比较难破解
方法二分离服务器端和客户端，无法破解
用纯php代码破解就是分分钟的事。
------解决思路----------------------
在PHP里面加入一段判断网址的代码
然后将所有代码都加密
只卖使用权不卖源码
然后卖出去
------解决思路----------------------
程序内包含授权判断、程序需要加密
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