In an industry first, 20th Century Fox is expected to announce Tuesday that the special-edition DVD of “Live Free or Die Hard” will come with an electronic copy of the complete movie that can be played on a computer and select portable video players.

“This may be the killer app, where you have physical media that allows you to have a big-screen experience and at the same time move the file around to other devices and have a great experience there as well,” said Mike Dunn, worldwide president of 20th Century Fox Home Entertainment, the studio’s home-video division.

Apple Inc.’s next-generation operating system, Mac OS X “Leopard,” will be available Oct. 26 for $129, and Apple’s online store is taking pre-orders, the company said Tuesday.

Leopard was originally due in June, but Apple said in April that it needed to divert resources so it could launch the much-anticipated iPhone on time. Such product delays are rare for the Cupertino-based company.

Leopard, which the company says will offer more than 300 new features, is the sixth major upgrade Apple has made to Mac OS X since the desktop operating system debuted in 2001.

Napster Inc, the digital music service, said on Tuesday it plans to attract more customers by moving to a Web-based platform allowing users to play their music from any computer without having to download any additional software.

The move is intended to open up the service and attract more paying subscribers by making the Napster platform more flexible and compatible with any Internet-enabled device.

Before now most Napster subscribers could only listen to their music after downloading the Napster software application on to their personal computers. This is similar to a model currently used by Apple Inc’s iTunes Music Store, which is the market leader with more than 70 percent of all digital music sales.

“With this new platform Napster can easily be integrated into consumer electronics devices or integrated into other Web sites such as social networking sites,” said Christopher Allen, chief operating officer at Napster.

Online video leader YouTube on Monday 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.

To find and remove copyrighted music, YouTube already uses separate filtering tools developed by Los Gatos-based Audible Magic Corp.