pywv

pywv is a Python-based tool for parsing, analyzing, and interacting with Widevine (WVD) device files and associated DRM structures. It provides low-level access to device data, cryptographic components, and license-related metadata, enabling precise inspection and controlled handling of Widevine workflows.

Features

Parsing and loading of Widevine Device (WVD) files
Support for WVD version migration (v1 → v2)
Extraction of device attributes (system ID, security level, client identification)
Decoding of Widevine protobuf structures (ClientIdentification, certificates, licenses)
Integration with cryptographic primitives (RSA, AES, CMAC, HMAC)
Parsing and manipulation of PSSH (Widevine / PlayReady) containers
License processing and content key extraction via CDM workflows

Requirements

Python 3.9 or higher
pycryptodome
construct
protobuf
pymp4
requests

Installation:

pip install pycryptodome construct protobuf pymp4 requests

Usage

python pywv.py [options]

Examples

Basic Usage

import requests
from pywv import PSSH, Device, Cdm

pssh = PSSH("AAAAW3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADsIARIQ62dqu8s0Xpa7z2FmMPGj2hoNd2lkZXZpbmVfdGVzdCIQZmtqM2xqYVNkZmFsa3IzaioCSEQyAA==")

device = Device.load("xiaomi_redmi_note_4x_15.0.0_e15a9e5f_8159_l3.wvd")
cdm = Cdm.from_device(device)
session_id = cdm.open()

try:
    challenge = cdm.get_license_challenge(session_id, pssh)

    license_response = requests.post(
        "https://cwip-shaka-proxy.appspot.com/no_auth",
        data=challenge,
    )
    license_response.raise_for_status()

    cdm.parse_license(session_id, license_response.content)

    for key in cdm.get_keys(session_id):
        print(f"[{key.type}] {key.kid.hex}:{key.key.hex()}")

finally:
    cdm.close(session_id)

Using JSON Device Configuration

# wv.json example:
# {
#   "security_level": 3,
#   "session_id_type": "android",
#   "private_key_available": true,
#   "vmp": false
# }

import json
import requests
from pathlib import Path
from pywv import PSSH, Device, Cdm

base_path = Path(__file__).resolve().parent

with open(base_path / "wv.json", "r", encoding="utf-8") as f:
    wv = json.load(f)

pssh = PSSH("AAAAW3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADsIARIQ62dqu8s0Xpa7z2FmMPGj2hoNd2lkZXZpbmVfdGVzdCIQZmtqM2xqYVNkZmFsa3IzaioCSEQyAA==")

if not wv.get("private_key_available", True):
    raise ValueError("This device profile does not include a private key")

device_kwargs = {
    "private_key": base_path / "device_private_key",
    "client_id": base_path / "device_client_id_blob",
    "type_": wv.get("session_id_type", "ANDROID").upper(),
    "security_level": wv.get("security_level", 3),
}

vmp_path = base_path / "device_vmp_blob"
if wv.get("vmp", False) and vmp_path.exists():
    device_kwargs["vmp"] = vmp_path

device = Device.from_files(**device_kwargs)

cdm = Cdm.from_device(device)
session_id = cdm.open()

try:
    challenge = cdm.get_license_challenge(session_id, pssh)

    license_response = requests.post(
        "https://cwip-shaka-proxy.appspot.com/no_auth",
        data=challenge,
    )
    license_response.raise_for_status()

    cdm.parse_license(session_id, license_response.content)

    for key in cdm.get_keys(session_id):
        print(f"[{key.type}] {key.kid.hex}:{key.key.hex()}")

finally:
    cdm.close(session_id)

Disclaimer

This tool is intended strictly for educational, research, and interoperability purposes. The author does not support or encourage the misuse of DRM systems or unauthorized access to protected content.

Issues and Support

For bug reports, feature requests, or general inquiries, please open an issue in the repository.

Support and updates will be provided as availability permits.

Acknowledgements

This project is based on pywidevine, with modifications and restructuring to support standalone usage and extended functionality for working with WVD and PSSH data.

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