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It takes music files from Deezer, with very high quality (FLAC & MP3 320kbps).
After Deezer's patch, this is so far the only way to get FLACs (& MP3 320 recently) for free.
Other methods to get FLACs from Deezer, like deemix, freezer, deezloader, etc. no longer work without paying for Deezer's HiFi subscription (there's a limited free trial, but credit card details are required).