Legally, the audio files are intellectual property owned by the publisher. They are not intended to be "free" standalone files. Access is granted through the purchase of the book. This ensures that the authors, publishers, and developers are compensated for their work.
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Publishers of Dutch language materials often provide companion websites. Legally, the audio files are intellectual property owned
Buy the book new (which includes the code) or look for a second-hand copy where the previous owner left the audio code unused. If you must go the free route, check your local library. The audio quality is high and essential, but it is a paid resource for a reason. This ensures that the authors, publishers, and developers
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