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Revert "fix(drm): add track ID fallback for mp4decrypt CBCS zero-KID content"

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This reverts commit 23466cae8b.
This commit is contained in:
Andy
2026-03-25 14:39:08 -06:00
parent 23466cae8b
commit fe1ccd085c
2 changed files with 0 additions and 38 deletions
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19
unshackle/core/drm/playready.py
View File

@@ -356,25 +356,6 @@ class PlayReady:
key_hex = key if isinstance(key, str) else key.hex()
key_args.extend(["--key", f"{kid_hex}:{key_hex}"])
# Also pass keys by track ID as fallback for CBCS content where the
# tenc box may have an all-zeros default_KID (common with HLS/FairPlay),
# causing mp4decrypt to fail matching KID-based keys silently.
if self.content_keys:
first_key = next(iter(self.content_keys.values()))
first_key_hex = first_key if isinstance(first_key, str) else first_key.hex()
try:
with open(path, "rb") as f:
header = f.read(200_000)
tenc_idx = header.find(b"tenc")
if tenc_idx >= 0:
tenc_data = header[tenc_idx + 4:] # after box type
version = tenc_data[0]
default_kid = tenc_data[8:24] if version >= 1 else tenc_data[6:22]
if default_kid == b"\x00" * 16:
key_args.extend(["--key", f"1:{first_key_hex}"])
except OSError:
pass
cmd = [
str(binaries.Mp4decrypt),
"--show-progress",

19
unshackle/core/drm/widevine.py
View File

@@ -276,25 +276,6 @@ class Widevine:
key_hex = key if isinstance(key, str) else key.hex()
key_args.extend(["--key", f"{kid_hex}:{key_hex}"])
# Also pass keys by track ID as fallback for CBCS content where the
# tenc box may have an all-zeros default_KID (common with HLS/FairPlay),
# causing mp4decrypt to fail matching KID-based keys silently.
if self.content_keys:
first_key = next(iter(self.content_keys.values()))
first_key_hex = first_key if isinstance(first_key, str) else first_key.hex()
try:
with open(path, "rb") as f:
header = f.read(200_000)
tenc_idx = header.find(b"tenc")
if tenc_idx >= 0:
tenc_data = header[tenc_idx + 4:] # after box type
version = tenc_data[0]
default_kid = tenc_data[8:24] if version >= 1 else tenc_data[6:22]
if default_kid == b"\x00" * 16:
key_args.extend(["--key", f"1:{first_key_hex}"])
except OSError:
pass
cmd = [
str(binaries.Mp4decrypt),
"--show-progress",