Led by a local bookstore owner and the ACLU, the suit challenges the constitutionality of a Utah law on a First Amendment basis.

The law would require the attorney general to create a list of sites with adult content.

Shops like the King's English could face criminal charges if they don't remove "potentially harmful material" or require age verification for their sites.

Internet providers could be required to block sites with potentially harmful material, which some say would affect unrelated sites.