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