After the revelations of mass surveillance technologies revealed by US Whistleblower Edward Snowden and British activity within it, I was reminded of the world war Two propaganda image by Kenneth Bird, aka Fougasse. There were many variations on the original image, this one is hosted by the Victoria and Albert Museum.
Updated 22nd August 2013: The story about the detention of David Miranda at London Heathrow has also crystalised many of the complicated debates swirling around the collection and possession of public and private data in the digital age.
This article by Adrian Monck offers an overview of the global debate which stretches across many individual jurisdictions.