The International Rugby Board will come down hard on any companies carrying out illegal marketing campaigns around the Rugby World Cup.
The companies will be prosecuted under the Major Event Management Act, which protects the rights of the tournament's organisers and sponsors by stopping others associating themselves with the event without paying.
Organisers say they have sent hundreds of letters to people telling them they are breaking the rules, but say most of the breaches have been unintentional.
However, the IRB says the risk of big companies deliberately trying to ambush the event is growing, as kick-off gets closer.
Teams of enforcement officers from the Ministry of Economic Development and councils will be policing any campaigns.
Don't bank on late tickets
IRB chief executive Mike Miller says New Zealanders are mistaken if they think they will be able to buy tickets to the games they want if they wait until the day of the match.
The event begins in Auckland on 9 September and about 170,000 tickets are still to be sold.
Mr Miller says he is sure most tickets will be sold.
he told Morning Report that many people he has spoken to say they are going to the Cup, but have not yet bought tickets. He says they may miss out if they don't buy tickets in advance.