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如何设计带时间限制的激活码?

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如何设计带时间限制的激活码?

我做了个软件,想用激活码方式授权,有些只想授权1个星期,光是授权的话,用MD5做加密的,但是怎么让激活码带着授权时间让程序识别呢?
请教大神们


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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别想着放客户端，改了电脑时间你这个程序就over了。建议放在服务端认证，启动的时候使用HTTP方式去服务端验证是否过期


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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