Microsoft cooperated with US National Security Agency (NSA) allowing agents to circumvent its own encryption system and spy on citizens' emails, chats and documents stored in its cloud-based SkyDrive service, the Guardian reported on 12 July.

According to the British newspaper, “the files provided by Edward Snowden illustrate the scale of co-operation between Silicon Valley and the intelligence agencies over the last three years.”

The documents give more details on the Prism programme, whi...

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