Um rápido Google me diz ...
"The FLAC stream is encrypted, though it is possible to find the encryption key in a JSON file that the Tidal API pulls right before streaming a song including the direct song URL and as well as the key, but I’m not sure of the algorithm used. I’ve tested many times with OpenSSL to decrypt the files with AES-128 and 256. Either I’ve setup OpenSSL wrong, or they’re using Salsa20 to encrypt the streams. The API calls are going over HTTPS while the streams are not."
- em suma, você não vai fazer isso.