A: Many like FLAC or ALAC are. But others can be somewhat deceiving. For example Sony's ATRAC Lossless audio files.
ATRAC Lossless is actually an interesting format. It works differently than FLAC or ALAC -- the way I understand it is that ATRAC lossless is actually a lossy ATRAC3 file with additional information ("correction data") that allows the lossless sound to be reconstituted. Kind of like packaging the water and the Top Ramen separately in the same box to reconstitute the whole noodles. Somehow that isn't the same as cooking the ramen from scratch.
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