QPDF is a C++ library and set of programs that inspect and manipulate the structure of PDF files. It can encrypt and linearize files, expose the internals of a PDF file, and do many other operations useful to end users and PDF developers.
http://qpdf.sourceforge.net/
http://qpdf.sourceforge.net/
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ReplyDeleteI don't know - a random piano instrumental from Youtube's audio listing
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