I'm using PDF-XChange to view pdf's. I have one pdf that has lock on it:
And I can't copy text from it:
How to solve copy/paste problem?
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It seems that this PDF file was secured using the "password security" option, with some usage restrictions applied (https://helpx.adobe.com/acrobat/using/securing-pdfs-passwords.html).
To copy and paste text from such PDF file, you should at first remove security, using a tool like QPDF (http://qpdf.sourceforge.net/), invoking it with a syntax like this:
qpdf --decrypt encrypted.pdf decrypted.pdf
