title: PDF: split pages containing more than one presentation slide per page
body: <p>Course material often contains more than one slide per PDF-page. I'd like to write a command line script that splits those pages up so that each page of the PDF contains just one slide. I've seen a lot of different arrangements of the slides on a page, but within a single PDF it's always the same, so a per PDF configuration of the cutting geometry should be sufficient.</p>
  
  <p>Which free libraries or tools offer this functionality?</p>