Rugby World Cup organisers want no fly-zones imposed over venues and are using public servants to stop what is known as ambush marketing.
The Ministry of Economic Development is sending enforcement officers to stop companies not sponsors of the tournament associating themselves with the event.
Rugby World Cup Ltd says it is using the tactics to protect sponsors' rights. Organisers are also working with local councils to see if no-fly zones can be put in place over venues during games.
Rugby World Cup general manager Ross Young says the measures are to protect sponsors and places like Auckland, which will hold key games, will require more staff.
"There are going to be more individuals across all stakeholders in a place like Auckland that there is in Invercargill or Whangarei.
"The bigger the impact, the bigger the game, the bigger the venue, the more chance of that sort of malicious attack."
Mr Young says says the most serious concern is ticket scalpers or companies who are not sponsors flying banners over venues.
However, the founder of the Power Sponsorship says smart companies that want to use ambush marketing will think of ways to get around restrictions.
Kim Skildum-Reid says at football's World Cup in Germany in 2006 Nike, which was not an official sponsor, used televisions on the sides of public buses to show games and attract viewers.
The Rugby World Cup begins on 9 September at Eden Park in Auckland.
