Tony Mullin uses green screen technology to circumvent the Serious Organized Crime and Police Act 2005, which prohibits anyone staging spontaneous protests within a 1km radius of Westminster’s Houses of Parliament.

Blank placards can be carried during the video-taped event, overlaid with poster designs and slogans, and uploaded to YouTube (or otherwise distributed.) About a year ago,he students led a group of volunteers on a walk through the exclusion zone carrying blank green placards.

In essence, anyone with the means can add their message to the footage.
Via Not An Alternative via wemakemoneynotart.
he he he
I so love clever people.