PDF is one of the most common text formats online. From Ebooks to codes all the available. Reason it's easy to prevent privacy since once you password protect it no one can copy it. Adobe Acrobat even has settings to prevent underside copying of the file i.e save as text is disabled. But you can use these software's to crack open those files .You can remove all restrictions.

techol.blogspot.com/2009/02/remove-restrictions-from-pdf-files.html

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