Online video leader YouTube has rolled out long-awaited technology to automatically remove copyrighted clips, hoping to placate movie and television studios fed up with the Web site’s persistent piracy problems.

The filtering tools are designed so the owners of copyrighted video can block their material from appearing on YouTube, which has become a pop culture phenomenon in its 2-year existence. The tools also give the owners of copyrighted video the option to sell ads around their material if they want the clips to remain available on YouTube.