qpdf: qpdf (Command-line tools and library for transforming PDF files)
qpdf:
qpdf: QPDF is a program that does structural, content-preserving
qpdf: transformations on PDF files.  It could have been called something
qpdf: like pdf-to-pdf.  It also provides many useful capabilities to
qpdf: developers of PDF-producing software or for people who just want to
qpdf: look at the innards of a PDF file to learn more about how they work.
qpdf:
qpdf: Homepage: http://qpdf.sourceforge.net/
qpdf:
qpdf: