AVATAR {COLLECTOR’S DEFINITIVE EDITION} (VOLUMES 1-6)–Its history?

So DAKoftheOTA posted the AVATAR {COLLECTOR’S DEFINITIVE EDITION} (VOLUMES 1-6) on here, and I was wondering…
what’s its history?

Where did it come from? Who provided the release? Or is this the one that mysteriously appeared on the internet leaked from an unknown source? I mean, I doubt that, considering that approximately 3 of the tracks were fan-edits (the last songs in the movie).

Could anyone help? I’ve been trying to do some research on this but I’ve been able to find little info, just the garbled up text that Google Translate gives me on Chinese forums…Thanks!