Question about reading the PDF ~ ~ Online Great God

Online to find some information, and then write a method to read the PDF , and then run after an error saying : "You do not have permission to extract text" looks like that there is no authority. My share of the PDF is encrypted , the password himself unknown ( hypothetical ) there is no way to read it?
If you know the password or that I do ? You can read it ? Specifically how to write ?

thank god online
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1 decrypt saved as

2 to see if you have to use the program interface overloaded methods or you can set passwords.
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have found a direct online can crack encrypted thanks ~ ~ ~ ~ seal paste it
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Great God , how do you decrypt , I also decrypt , but read or quoted with java this fault is it ? seeking answers ...