Six people pleaded guilty to charges related to more than $100 million in stolen software such as Windows XP that authorities said was one of the largest such piracy schemes prosecuted by the U.S. government.

Tammy Dickinson, U.S. attorney for the western district of Missouri, said the case involved more than $100 million worth of stolen or counterfeit software products, including about 170,000 access codes for Adobe Systems and Microsoft products, including Windows 7 and Windows XP. Product key codes are used to obtain access to various copyrighted software programs.

Federal authorities also confiscated more than $20 million in assets, including $10 million from bank and investment accounts and 27 pieces of real estate valued at a total of about $10 million, Dickinson said. Authorities estimate the defendants made about $30 million in profits from selling the pirated software.