pdftk: pdftk (pdf toolkit)
pdftk: 
pdftk: If PDF is electronic paper, then pdftk is an electronic
pdftk: staple-remover, hole-punch, binder, secret-decoder-ring, and
pdftk: X-Ray-glasses. Pdftk is a command-line tool for doing everyday things
pdftk: with PDF documents. Keep one in the top drawer of your desktop and use
pdftk: it to: Merge PDF documents, split PDF documents, apply watermark,
pdftk: repair corrupt PDF, update PDF metadata and much more. pdftk does not
pdftk: require Acrobat and is free software (GPL).
pdftk: 
pdftk: