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Exclusive: Threats range from governments trying to control citizens to the rise of Facebook and Apple-style 'walled gardens'
The threat to the freedom of the internet comes, he claims, from a combination of governments increasingly trying to control access and communication by their citizens, the entertainment industry's attempts to crack down on piracy, and the rise of "restrictive" walled gardens such as Facebook and Apple, which tightly control what software can be released on their platforms.
Brin's criticism of Facebook is likely to be controversial, with the social network approaching an estimated $100bn (£64bn) flotation. Google's upstart rival has seen explosive growth: it has signed up half of Americans with computer access and more than 800 million members worldwide.
From the attempts made by Hollywood to push through legislation allowing pirate websites to be shut down, to the British government's plans to monitor social media and web use, the ethos of openness championed by the pioneers of the internet and worldwide web is being challenged on a number of fronts.
Brin acknowledged that some people were anxious about the amount of their data that was now in the reach of US authorities because it sits on Google's servers. He said the company was periodically forced to hand over data and sometimes prevented by legal restrictions from even notifying users that it had done so.
He said: "We push back a lot; we are able to turn down a lot of these requests. We do everything possible to protect the data. If we could wave a magic wand and not be subject to US law, that would be great. If we could be in some magical jurisdiction that everyone in the world trusted, that would be great … We're doing it as well as can be done."