code: def decrypt(self, encryption_key, iv, encrypted_data):
          
  
          logger.info('Decrypting subtitles with length (%d bytes), key=%r',
              len(encrypted_data), encryption_key)
          return zlib.decompress(aes_decrypt(encryption_key, iv, encrypted_data))
docs: Decrypt encrypted subtitle data
  
          @param int subtitle_id
          @param str iv
          @param str encrypted_data
          @return str