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Same as RealAudio atrc, the RealAudio streams are XOR scrambled.

Stored in WAV/AVI, RM and Oma/Omg containers.

Sony Dynamic Digital System (SDDS), used in theatres, is based on ATRAC. Common use of the codec is in Sony made Minidisc and Flash based players.

There are some known variants:

  • ATRAC3
  • ATRAC3plus
  • ATRAC Advanced Lossless (AAL)