Multiple operation on pdf in ubuntu using pdftk package

Pdftk package provides a lot of options  to work on Pdf, like concatenation, bursting, bursting  selected number of pages, Encryption , Decryption

 Examples:-
     

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

• Encrypt a PDF using 128-bit strength (the default), withhold all per-       missions (the default)
  pdftk 1.pdf output 1.128.pdf owner_pw foopass

• Same as above, except password 'baz' must also be used to open output       PDF
  pdftk 1.pdf output 1.128.pdf owner_pw foo user_pw baz

• Join in1.pdf and in2.pdf into a new PDF, out1.pdf
  pdftk in1.pdf in2.pdf cat output out1.pdf
  or (using handles):
  pdftk A=in1.pdf B=in2.pdf cat A B output out1.pdf
  or (using wildcards):
  pdftk *.pdf cat output combined.pdf

• Remove 'page 13' from in1.pdf to create out1.pdf
  pdftk in.pdf cat 1-12 14-end output out1.pdf
  or:
  pdftk A=in1.pdf cat A1-12 A14-end output out1.pdf

• Join two files, one of which requires the password 'foopass'. The out-       put is not encrypted.
  pdftk A=secured.pdf 2.pdf input_pw A=foopass cat output 3.pdf

• Uncompress PDF page streams for editing the PDF in a text editor (e.g.,       vim, emacs)

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

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

• Rotate the first PDF page to 90 degrees clockwise
  pdftk in.pdf cat 1E 2-end output out.pdf

• Rotate an entire PDF document to 180 degrees
  pdftk in.pdf cat 1-endS output out.pdf