(see: man pdftk)

***
 pdftk <input PDF files | - | PROMPT>
	    [input_pw <input PDF owner passwords | PROMPT>]
	    [<operation> <operation arguments>]
	    [output <output filename | - | PROMPT>]
	    [encrypt_40bit | encrypt_128bit]
	    [allow <permissions>]
	    [owner_pw <owner password | PROMPT>]
	    [user_pw <user password | PROMPT>]
	    [flatten] [compress | uncompress]
	    [keep_first_id | keep_final_id] [drop_xfa]
	    [verbose] [dont_ask | do_ask]
       Where:
	    <operation> may be empty, or:
	    [cat | attach_files | unpack_files | burst |
	     fill_form | background | stamp | generate_fdf
	     dump_data | dump_data_fields | update_info]
***

Decrypt a PDF
         pdftk secured.pdf input_pw foopass output unsecured.pdf


Burst  (split) a  single  PDF  document  into  pages  and  dump  its  data   to doc_data.txt
         pdftk in.pdf burst

Burst  (split) a single PDF document into  encrypted  pages.  Allow low-quality printing
         pdftk in.pdf burst owner_pw foopass allow DegradedPrinting