The order was issued in a lawsuit filed against Gator in June by The Washington Post, The New York Times, Dow Jones and seven other publishers, which allege the company's ads violate their copyrights and steal revenue.
On Friday, Judge Claude Hilton granted the motion, according to the clerk's office at the federal court in Alexandria, Va., where the suit was filed.
The companies had sought a temporary injunction against Gator preventing it from delivering ads keyed to their sites pending the resolution of the suit, in which they are seeking a permanent injunction against the company and monetary damages for any advertising dollars made from their Web pages.
Terence Ross, attorney for the plaintiffs, said the judge quickly granted the motion, prohibiting Gator "from tampering with the 16 Web sites involved in the litigation during the pendency of the case.
"This really is a clear-cut case in my opinion; Gator is infringing our copyrights and trademarks. The judge came to that conclusion, and a jury will make the same decision in a trial."
By delivering unauthorized pop-up ads, Gator is altering the intended display of the publishers' works, a right that has been recognized by the Supreme Court, Ross has argued.
In early August the judge will set a court schedule, and the case will go to trial before the end of the year, Ross said.
In a statement issued Friday, Redwood City, Calif.-based Gator said that it would honor the judge's request but asked for an expedited trial.
"We are highly confident that once all the facts are presented in the upcoming trial, no court will issue a ruling eliminating a consumer's right to decide for themselves what is displayed on their own computer screens," Gator CEO Jeff McFadden said in the statement.
"Such a ruling would attack a consumer's right to use hundreds of popular software applications that automatically display separate windows while the consumer is surfing the Internet."
Gator develops software that manages passwords and fills out forms for about 10 million Web surfers who often download the application unwittingly through other popular file-sharing programs. Also bundled in Gator's software is a program called OfferCompanion, which monitors Web surfing behavior and delivers targeted pop-up ads to viewers. For example, a Web surfer may see an advertisement for Ford Motor--delivered by Gator--while visiting Toyota.com.
Gator has been selling such advertising for more than a year and has accumulated several top-tier advertisers, including Target.com. According to Ross, the plaintiffs were stirred to action after the company published marketing material in April essentially promising ad buyers placement on the Web sites of specific publications, including The New York Times.
According to the suit, Gator is "essentially a parasite on the Web that free rides on the hard work and the investments of plaintiffs and other Web site owners. In short, Gator sells advertising space on the plaintiffs' Web sites without (their) authorization and pockets the profits from such sales."
The decision does not bar Gator from delivering pop-up ads over other sites. But it could establish a precedent that prohibits third-party software operators from delivering ads that alter another Web page. It also highlights mounting tension over tactics used by Gator and others.
Earlier this year, WeightWatchers.com sued rival DietWatch.com for using Gator to deliver ads to visitors of its site. On June 11, a court granted WeightWatchers a permanent injunction barring DietWatch from serving ads on its site.
Last year, the Interactive Advertising Bureau (IAB) criticized Gator for selling banner ads that obscure those sold by online publishers. Gator sued the IAB, alleging "malicious disparagement" over its statements, but the two parties found common ground when Gator agreed to stop selling banner overlays.