Why cannot I copy selected text from a pdf file opened in Adobe Reader XI?

Hi all,
I had a problem when I tried to copy some selected text on a pdf file([Linux.System.Programming(2nd,2013.5)].Robert.Love.文字版.pdf) , which was opened in Adobe Reader XI as below (non-English version):
The error's text could be primarily translated as "An error occured when copied to clipboard. Internal Error." I'm not sure about the reason of this. I guess it is a problem or bug related to operating system or Adobe Reader XI. I had this problem when I used other versions of Adobe Reader though I cannot remember the exact number of versions now.
The version of XI I'm using is 11.0.0. The operating system is XP SP3.
As I was writing this question, the problem disappeared and I cannot reproduce it again now.
Could anyone help explain why the error message appearred or why the problem disappearred? If there is referrence provided, that would be finer. Thank you.
Message was edited by: photonxp

The document has been protected.
Even if it doesn't have a password, the original author has applied "plagiarism" prevention to it.
There is a program from Wondershare, called PDF Password remover, that will remove such restrictions, but I'm not allowed to recommend it, only to point out it's existence.

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