title_body: How can I personalize each copy of a PDF to add the reader's name or email address to each page?
upvoted_answer: Create a watermark pdf which contains the footer using imagemagick:
  
  convert -background none -geometry +0+0 -fill \#000000 -pointsize 12 label:"From the library of..." -set label '' -page A4 watermark.pdf
  
  
  It creates a simple pdf ( size: A4 ) with the text From the library of... at the bottom left corner. You might change the font, the position of the text, the size of the text...
  
  This watermark.pdf can be added to ( all pages of ) a pdf file using pdftk:
  
  pdftk input.pdf stamp watermark.pdf output output.pdf
  
  
  I've used stamp instead of watermark because it overlays on top of the input pdf.