import sys
  import PyPDF2
  
  pdf_file = open("kos.pdf","rb")
  pdfReader = PyPDF2.PdfFileReader(pdf_file)
  
  pdfWriter = PyPDF2.PdfFileWriter()
  pdfWriter.appendPagesFromReader(pdfReader)
  pdfWriter.encrypt("password")
  
  outfile = open("enc_kos_pdf","wb")
  pdfWriter.write(outfile)
  
  
  print "Hello"