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+QPDF is a command-line program that does structural, content-preserving
+transformations on PDF files.  It could have been called something
+like pdf-to-pdf. It also provides many useful capabilities to
+developers of PDF-producing software or for people who just want
+to look at the innards of a PDF file to learn more about how they
+work.
+
+QPDF is capable of creating linearized (also known as web-optimized)
+files and encrypted files. It is also capable of converting PDF
+files with object streams (also known as compressed objects) to
+files with no compressed objects or to generate object streams from
+files that don't have them (or even those that already do). QPDF
+also supports a special mode designed to allow you to edit the
+content of PDF files in a text editor. For more details, please
+see the documentation links below.
+
+QPDF includes support for merging and splitting PDFs through the
+ability to copy objects from one PDF file into another and to
+manipulate the list of pages in a PDF file. The QPDF library also
+makes it possible for you to create PDF files from scratch. In this
+mode, you are responsible for supplying all the contents of the
+file, while the QPDF library takes care off all the syntactical
+representation of the objects, creation of cross references tables
+and, if you use them, object streams, encryption, linearization,
+and other syntactic details.
+
+QPDF is not a PDF content creation library, a PDF viewer, or a
+program capable of converting PDF into other formats. In particular,
+QPDF knows nothing about the semantics of PDF content streams. If
+you are looking for something that can do that, you should look
+elsewhere. However, once you have a valid PDF file, QPDF can be
+used to transform that file in ways perhaps your original PDF
+creation can't handle. For example, programs generate simple PDF
+files but can't password-protect them, web-optimize them, or perform
+other transformations of that type.