From Discovery Wiki

Freeports are stations that are open to any and all pilots as long as they have not specifically angered the owners. They generally find themselves a host to a wide assortment of pilots from lawfuls to pirates to bounty hunters, though violence onboard is strictly forbidden. They also act as trade hubs for necessary goods like food and fuel in the far reaches of sirius.

There is a strictly enforced No Fire Zone of 5k around Zoner freeports, breaking this for anything other than self defense or predetermined lawful police action (with sufficient warning to the owners) is punishable by banishment from that or any freeport.