not working

[ghost]

i don't know how to make it work. can you pls tell me about the license url. what is it and how to get it? I am just doing this and getting this:

wvclient.py -path E:\encrypted.mp4
Traceback (most recent call last):
  File "C:\Users\(user)\Downloads\Compressed\widevineclient3-main\wvclient.py", line 132, in <module>
    main(args)
  File "C:\Users\(user)\Downloads\Compressed\widevineclient3-main\wvclient.py", line 116, in main
    cdm.work(pssh)
  File "C:\Users\(user)\Downloads\Compressed\widevineclient3-main\wvclient.py", line 98, in work
    self.getContentKey(license_request_data, license_response_data)
  File "C:\Users\(user)\Downloads\Compressed\widevineclient3-main\wvclient.py", line 76, in getContentKey
    responseMessage.ParseFromString(license_response_data)
google.protobuf.message.DecodeError: Error parsing message with type 'video_widevine_server.sdk.SignedMessage'