请教php怎么判断pdf是否被加密了

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Release: 2016-06-13 13:05:37
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请问php如何判断pdf是否被加密了
是权限密码,就是可以浏览,无法修改的那种

我在做一个转换程序,如果加密了,直接卡死在那里,如果不解决可能直接导致项目流产哇...

------解决方案--------------------
加密了,就会有加密了的标志
你知道了加密原理,就可以找到加密标志
至于是用什么语言,并不是问题

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