The three civil liberties groups disagreed, saying that geographic blocking software is inexact. One vendor said it could pinpoint some Web users' locations to within a 20- or 30-mile radius, meaning the blocking technology would be ineffective on Kentucky's borders, the groups wrote. In addition, some Internet service providers run traffic through central servers, making geolocation impossible, the groups said. Many Internet users also use proxy services as well, they wrote.

Geolocation services could cost a Web site as much as US$500,000 per year, the groups added. "The location services that the trial court asserts can be used are not built into the Internet or available to all Web sites," the groups said. "On the contrary, they are very expensive."