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Add support for "hardened" Adobe DRM

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What took the most time was not reverse-engineering
the scheme, but actually finding books using it...

Closes #20, #25, #45
This commit is contained in:
a980e066a01
2022-02-22 23:47:51 +00:00
committed by noDRM
parent a1dd63ae5f
commit c5aebcca01
7 changed files with 66 additions and 39 deletions
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8
DeDRM_plugin/epubtest.py
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@@ -175,7 +175,7 @@ def getfiledata(file, zi):
return data
def encryption(infile):
# Supports Adobe (old & new), B&N, Kobo, Apple, Readium LCP.
# Supports Adobe (old & new), B&N, Kobo, Apple, Readium LCP.
encryption = "Error"
try:
with open(infile,'rb') as infileobject:
@@ -206,10 +206,8 @@ def encryption(infile):
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
expr = './/%s' % (adept('encryptedKey'),)
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) == 172:
encryption = "Adobe (old)"
if len(bookkey) == 192:
encryption = "Adobe (new)"
if len(bookkey) >= 172:
encryption = "Adobe"
elif len(bookkey) == 64:
encryption = "B&N"
else: