From New York, to London, to Sydney, to Cologne, to Bucharest, there has been a wave of protests against politicians, banks and financial institutions.

Anybody watching coverage of the demonstrations may have been struck by a repeated motif - a strangely stylised mask of Guy Fawkes with a moustache and pointy beard.

Wikileaks founder Julian Assange arrived at the Occupy London Stock Exchange protest to make a speech wearing one of these masks. He took it off, reportedly at the insistence of the police.

They were thought to have been used first by the notorious hacker-activist group Anonymous in 2008 during a protest against Scientology, but have since spread throughout the global protest movement.

The masks are from the 2006 film V for Vendetta where one is worn by an enigmatic lone anarchist who, in the graphic novel on which it is based, uses Fawkes as a role model in his quest to end the rule of a fictional fascist party in the UK.