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Keep Calm and Hack The Planet postcard
In the film Hackers, the pirate TV radio show was "Hack The Planet" - and this was the cry shouted in the film by character Dade Murphy (former child hacker) when he was unjustly arrested and put into a police car. It's an important phrase to the communities DEF CON serves for those reasons, and more.
See more photos and read much more about the activities, outrageous parties and more mischief at DEF CON 21 in: