{copy-paste} is about copying text and other elements from one place (often a PDF file) and allowing it to be pasted. Searching for text (in a PDF file) is a process closely related to copying because both use the OCR (optical character recognition) layer in the PDF file.

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Is it possible to produce a PDF with un-copyable text?

Is it possible to produce a PDF with un-copyable text? I mean, when you want to copy text from the PDF, you can't copy it or what you copy is nonsense characters.
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Make ligatures in Linux Libertine copyable (and searchable)

I'm currently working on an essay written in LaTeX form. I'm facing problems with ligatures - in my pdf output (rendered using pdftex) opened in Adobe Reader I get X's and V's when copy-pasting words ...