A federal judge last week dismissed a three-year-old lawsuit that accused Microsoft of duping customers when it fed them company anti-piracy software as a critical security update, court documents show.

A federal judge has killed class-action allegations in a lawsuit that accused Microsoft of misleading consumers when it fed them anti-piracy software under the auspices of a critical security update, according to court documents.

A federal judge has granted Microsoft's request to keep secret details of its Windows antipiracy technology after the company claimed hackers could exploit the information if it were made public.