Pirated Windows copies to get fewer fixes

Microsoft Corp. plans to severely curtail the ways in which people running pirated copies of its dominant Windows operating system can receive software updates, including security fixes.

The new authentication system, announced Tuesday and due to arrive by midyear, will still allow people with pirated copies of Windows to obtain security fixes, but their options will be limited. The move allows Microsoft to use one of its sharpest weapons -- access to security patches that can prevent viruses, worms and other crippling attacks -- to thwart a costly and meddlesome piracy problem.

But some security experts said the crackdown also could increase Internet security problems in general, if there is a spike in unsecured computers open to attack, which then could be used to attack others.