To unlock a pdf file using 'gs' in linux shell and convert the content to text

pdf_to_text_converter.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This code is for being used with pdfminer last version (Python 2.x)

from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from pdfminer.pdfpage import PDFPage
from cStringIO import StringIO

def convert_pdf_to_txt(path):
	"""
	function from http://stackoverflow.com/questions/5725278/
		python-help-using-pdfminer-as-a-library
	"""
	rsrcmgr = PDFResourceManager()
	retstr = StringIO()
	codec = 'utf-8'
	laparams = LAParams()
	device = TextConverter(rsrcmgr, retstr, codec=codec, laparams=laparams)
	fp = file(path, 'rb')
	interpreter = PDFPageInterpreter(rsrcmgr, device)
	password = ""
	maxpages = 0
	caching = True
	pagenos=set()
	for page in PDFPage.get_pages(fp, pagenos, maxpages=maxpages, password=password,caching=caching, check_extractable=True):
		interpreter.process_page(page)
	fp.close()
	device.close()
	str = retstr.getvalue()
	retstr.close()
	return str 
    

	
print(convert_pdf_to_txt("/home/salvaj/Documentos/BOE-A-2014-8133.pdf"))

pdf_to_text_converter_3.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This gist code is for being used with pdfminer3k package (Python 3.x)

from pdfminer.pdfinterp import PDFResourceManager, process_pdf
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from io import StringIO

def convert_pdf(path):

    rsrcmgr = PDFResourceManager()
    retstr = StringIO()
    codec = 'utf-8'
    laparams = LAParams()
    device = TextConverter(rsrcmgr, retstr, laparams=laparams)

    fp = open(path, 'rb')
    process_pdf(rsrcmgr, device, fp)
    fp.close()
    device.close()

    str = retstr.getvalue()
    retstr.close()
    return str

print(convert_pdf(r".\notas_simples\nota_simple_ul.pdf"))

unlock_pdf_file.bat

C:\> gswin32c -dSAFER -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sFONTPATH=%windir%/fonts;xfonts;. -sPDFPassword= -dPDFSETTINGS=/prepress -dPassThroughJPEGImages=true -sOutputFile=OUTPUT.pdf INPUT.pdf

unlock_pdf_file.sh

user@host~/Documents$ gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=unencrypted.pdf -c .setpdfwrite -f encrypted.pdf