Sky Television has banned a series of advertisements for Slingshot's internet service.
Slingshot general manager Taryn Hamilton said, and Sky confirmed, that the ban was because the advertisements included a brief reference to Global Mode.
Global Mode is a free feature provided by Slingshot that lets its customers bypass country blocks and sign up to overseas online services such as Netflix, which are not supposed to be offered in New Zealand.
Hamilton said Sky's ban was "unjustified and petty" and smacked of protectionism and censorship.
Sky TV spokeswoman Kirsty Way confirmed the advertisements had been rejected because of their references to Global Mode.
"We are a business that pays people who create television so we are against any form of piracy or the undermining of intellectual property rights," she said.
Global Mode was a way of illegitimately accessing Netflix which "did not pay for content rights in this territory", she said.
Hamilton said Global Mode existed only because "Kiwis wanted to access to quality streaming video at a good price".
"When and if local companies manage to finally crack that, then there will be no need for the service. But, until that time, people will use services like Global Mode so that they can see decent TV without having to get a second mortgage," he said.