Microsoft Office is sold as a bundle of computer software, including Word, Excel, and PowerPoint.

FORBES: Product Bundling is a Smart Strategy -- But There's a Catch

In computer superstores, 60% of software sold is games, and about 35% is business software.

ECONOMIST: MONITOR

ReDigi's software is designed to prevent sellers from reinstalling a sold song to their computer, and offers users the chance to check their libraries for illegal music.

BBC: US court to rule on ReDigi's MP3 digital music resales

While Apple's designs are unique, its hardware is powered by the same Intel microprocessors you'll find in any computer sold by Dell or Hewlett-Packard.

FORBES: Magazine Article