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The MP3 codec already existed, and touchscreens have nothing to do with a "common protocol", unless you count being a human with a capacitance as a protocol.

• sixbrx 12y ago
  MP3 existed but was proprietary.
  • XorNot 12y ago
    Irrelevant: free encoders were popular, and the early days of Napster meant most MP3s are CD-rips being uploaded by users. Apple made out like a bandit from that ecosystem since it was the original reason to own an iPod.