Adware distributor Direct Revenue LLC has agreed to pay $1.5 million to settle charges filed by the U.S. Federal Trade Commission (FTC).

The deal, announced Friday, is the second such agreement struck by the FTC with an adware vendor in the last four months. In November, Zango Inc. — also known as 180solutions — agreed to pay $3 million to settle similar allegations.

According to the FTC’s charges, Direct Revenue and its affiliates installed adware, including programs that produced pop-up ads, on users’ machines without properly disclosing what the software would do. In some cases, Direct Revenue affiliates exploited browser security flaws to install adware. The result, said the FTC, was “unfair and deceptive methods to download adware onto consumers’ computers and then obstruct them from removing it.”