How to remove security from a PDF file?

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Track title: CC M Beethoven - Piano Sonata No 3 in C 3

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Chapters
00:00 Question
00:25 Accepted answer (Score 64)
01:27 Answer 2 (Score 114)
02:51 Answer 3 (Score 39)
03:22 Answer 4 (Score 11)
04:21 Thank you

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Full question
https://superuser.com/questions/179064/h...

Answer 1 links:
https://github.com/qpdf/qpdf/releases
https://lwn.net/Articles/335415/

Answer 3 links:
[PDFUnlock]: http://www.pdfunlock.com/
[Weeny Free PDF Password Remover]: http://www.weenysoft.com/download.php?i

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Tags
#security #pdf

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