Brand exclusion zone / Graffiti exclusion zone:
"… While graffiti writer’s homes being raided by the police is not a rare phenomenon, this series of raids came as quite a shock to many of the artists as most had given up painting illegal graffiti some 15 years ago.
It was around then that the graffiti artists realised what point the police were trying to make with them. Having been arrested, they were questioned about what they considered petty matters – accusations of criminal damage in the ’90s, questions about websites and magazines that they were involved in. After being briefly questioned about these seemingly irrelevant matters, they were told that they were to be bailed until November on the condition that they did not use any form of railway in London (overground, tube or tram), carry spray paint (or other graffiti tools, presumably) at any time, or travel within a mile of any Olympic area."
Full article: The London Vandal