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Mark Surman from the Mozilla Foundation defends the principle of an open internet at the Quartz Next Billion event in London. And, Joyce Kim of Stellar.org describes how the principles underlying the workings of the net could be applied to the world's financial industry. Also, is Spotify's revamp a brave leap or a defence against Apple's forthcoming entry into their market? Plus, the technology that lets you share files using sounds.Presented by Rory Cellan-Jones, with special guest Cate Sevilla, Managing Editor of BuzzFeed UK.

Image: Cate Sevilla and Rory Cellan-Jones.