[an07her]

Yes, I don't want the streaming links. Source files should be the same.
And FLAC itself doesn't have encryption, and if links are visible I can access that and download it.

But I still don't understand how to get that FULL_PATH_ORIGIN.

I guess it's not possible, since you would implement it probably if it was.
Hope I'm not annoying, just trying to understand what happens if you can directly access FLAC without any tokens/sessionid.