The rules state that only official sponsors are allowed to use logos and text defined in the organisation's 2012 UK statutory marketing rights.

BBC: University of Derby removes unofficial Olympic sign

In response to the unrest in Egypt, the department has apparently instructed the Chinese media to use only dispatches sent by the official news agency, Xinhua, and either to bury news of events there or play up aspects that show the costs of turmoil.

ECONOMIST: The Year of the Rabbit starts badly

In theory, the president is entitled to use it at taxpayers' expense only when he is on official business.

ECONOMIST: Lexington