DENVER - Denver International Airport's now-free Wi-Fi service makes websites airport officials deem "provocative" unavailable to users.

Airport spokesman Chuck Cannon said officials decided to block potentially racy sites when the airport made its wireless Internet service free in November 2007. Previously, there was a fee for using the service.

In addition to blocking adult websites, the service's Internet filters also block sites like Vanity Fair's online magazine and BoingBoing.net.

Cannon said the airport would rather weather infrequent complaints about website access than deal with angry parents whose children might see pornography using the service.

Critics say Denver International Airport uses the same technology used by repressive regimes in Sudan and Kuwait.