Description:

Pdftk is a simple tool for doing everyday things with PDF documents.
It allows you to merge PDF documents, split PDF pages into a new
document, decrypt input as necessary (password required), encrypt
output as desired, apply a background watermark, fill PDF forms with
FDF data and/or flatten forms report on PDF metrics including Metadata
and Bookmarks, update PDF metadata, attach files to PDF pages or the
PDF document, unpack PDF attachments, burst a PDF document into single
pages, uncompress and re-compress page streams, repair corrupted PDF
(where possible).