PARIS — Going to the World Cup in South Africa? Bring your camera and your Visa card. But don’t wear a little orange dress, or you may get hauled into court.

That is what happened to two Dutch women who attended the Netherlands-Denmark soccer match Monday in the company of about three dozen others, all sporting the distinctive Dutch orange. The two are believed to have led an “ambush marketing” stunt on behalf of a Dutch beer brand, Bavaria.

“These women, who have been part of a larger group, are suspected to be involved in organized acts to conduct unlawful commercial activities during the Denmark-Netherlands match on Monday,” the South African police said in a statement Wednesday, after arresting the two women, confiscating their passports and releasing them on bail.

The arrests demonstrate the considerable lengths to which executives of FIFA, the soccer governing body, will go to protect sponsors of the World Cup, which include the official beer, Anheuser-Busch’s Budweiser.