Update README.md

README.md

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 # pywv
-pywv is a Python tool for parsing and working with Widevine (WVD) device files, PSSH data, and DRM-related cryptographic structures.
+
+**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:
+
+```bash
+pip install pycryptodome construct protobuf pymp4 requests
+```
+
+---
+
+## Usage
+
+```bash
+python pywv.py [options]
+```
+---
+
+## Examples
+
+### Basic Usage
+
+```python
+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
+
+```python
+# 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.