The preliminary injunction preventing the Chicago Transit Authority (CTA) from banning M- and AO-rated video game ads is now here to stay. GamePolitics has the PDF of US District Court Judge Rebecca Pallmeyer's May 17 ruling that places a "permanent injunction" on CTA ordinance No. 008-147, which banned the mature rated ads.

The CTA has agreed not to appeal the decision -- probably because it's already getting stuck with paying the Entertainment Software Association's lawyers' fees on this matter. According to the court document, if the CTA violates the permanent injunction, the ESA has the right to send the CTA a bill for any future attorneys' fees. ESA President Mike Gallagher said in a statement, "We are pleased that the CTA chose not to pursue this further and waste valuable resources on this matter."

Meanwhile, California is taking its game bill all the way to the US Supreme Court.

This article was originally published on Joystiq.