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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# lcpdedrm.py
# Copyright © 2021-2022 NoDRM
# Released under the terms of the GNU General Public Licence, version 3
# <http://www.gnu.org/licenses/>
# Revision history:
# 1 - Initial release
# 2 - LCP DRM code removed due to a DMCA takedown.
"""
This file used to contain code to remove the Readium LCP DRM
from eBooks. Unfortunately, Readium has issued a DMCA takedown
request, so I was forced to remove that code:
https://github.com/github/dmca/blob/master/2022/01/2022-01-04-readium.md
This file now just returns an error message when asked to remove LCP DRM.
For more information, see this issue:
https://github.com/noDRM/DeDRM_tools/issues/18
"""
__license__ = 'GPL v3'
__version__ = "2"
import json
from zipfile import ZipFile
from contextlib import closing
class LCPError(Exception):
pass
# Check file to see if this is an LCP-protected file
def isLCPbook(inpath):
try:
with closing(ZipFile(open(inpath, 'rb'))) as lcpbook:
if ("META-INF/license.lcpl" not in lcpbook.namelist() or
"META-INF/encryption.xml" not in lcpbook.namelist() or
b"EncryptedContentKey" not in lcpbook.read("META-INF/encryption.xml")):
return False
license = json.loads(lcpbook.read('META-INF/license.lcpl'))
if "id" in license and "encryption" in license and "profile" in license["encryption"]:
return True
except:
return False
return False
# Takes a file and a list of passphrases
def decryptLCPbook(inpath, passphrases, parent_object):
if not isLCPbook(inpath):
raise LCPError("This is not an LCP-encrypted book")
print("LCP: LCP DRM removal no longer supported due to a DMCA takedown request.")
print("LCP: The takedown request can be found here: ")
print("LCP: https://github.com/github/dmca/blob/master/2022/01/2022-01-04-readium.md ")
print("LCP: More information can be found in the Github repository: ")
print("LCP: https://github.com/noDRM/DeDRM_tools/issues/18 ")
raise LCPError("LCP DRM removal no longer supported")
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