http://en.wikipedia.org/wiki/Spotify
Quote:
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The Spotify software is proprietary and uses digital rights management to protect copyright holders. Users who agree to Spotify's Terms and Conditions may not reverse engineer the application.[46]
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Digital
Rights
Management = DRM = Encryption
If someone could crack the encryption it would be the holy grail of stream downloading. There are very few people in the world who could tell the difference between Ogg Vorbis at 320kbps and Lossless audio.