The rest of the device is a plastic, candy-bar-style affair with USB, HDMI and 3.5mm audio outputs on one side, with a gain control, delete button and full-sized SD card slot on the other.

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"Overcautious customers tend to disable Poproxy manually in the Task Manager (accessed by hitting Control-Alt-Delete in Windows), others get weary of the program and decide to block it when their personal firewall reports that Poproxy is trying to connect to the Internet, " said Van der Grift.

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"Internet users must have effective control of what they put online, and be able to correct, withdraw or delete it at will, " said Viviane Reding, Europe's digital rights commissioner, two months ago.

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