A Windsor Mill man, a former NASA employee, has pleaded guilty in Delaware federal court to buying more than a million dollars' worth of pirated software from black-market Chinese vendors who themselves were indicted Wednesday in federal court in Delaware, said the U.S. Immigration and Customs Enforcement agency, or ICE.

Cosburn Wedderburn, 38, described as a former NASA employee by federal authorities, recently pleaded guilty to conspiracy to commit criminal copyright infringement. ICE said in a statement that Wedderburn purchased more than $1 million worth of pirated software from several websites operated by Xiang Li.

Li, 35, and Chun Yan Li, 33, both of Chengdu, China, were charged Wednesday by a federal grand jury in a 46-count indictment with software piracy and illegally exporting U.S. technology to China.

Federal authorities said Xiang Li was arrested by Homeland Security Investigations agents last year; Chun Yan Li remains at large in Chengdu. Federal officials said the pair's illegal software operation cost companies $100 million in revenues.