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Add useful error message for the new, uncracked ADEPT DRM

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NoDRM
2021-11-15 19:51:36 +01:00
parent 40a8e4360b
commit 88dd1350c0
3 changed files with 36 additions and 1 deletions
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14
DeDRM_plugin/ineptpdf.py
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@@ -125,6 +125,9 @@ def unicode_argv():
class ADEPTError(Exception):
pass
class ADEPTNewVersionError(Exception):
pass
import hashlib
@@ -1615,7 +1618,16 @@ class PDFDocument(object):
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}encryptedKey'
bookkey = codecs.decode(''.join(rights.findtext(expr)).encode('utf-8'),'base64')
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) == 192:
print("This seems to be an Adobe ADEPT PDF with Adobe's new DRM")
print("This DRM cannot be removed yet. ")
print("Try getting your distributor to give you a new ACSM file, then open that in an old version of ADE (2.0).")
print("If your book distributor is not enforcing the new DRM yet, this will give you a copy with the old DRM.")
raise ADEPTNewVersionError("Book uses new ADEPT encryption")
bookkey = codecs.decode(bookkey.encode('utf-8'),'base64')
bookkey = rsa.decrypt(bookkey)
if len(bookkey) > 16: