How Apple's trademark for its iPod protects its brand

The iPod shape trademark gives Apple a new weapon in the fiercely competitive market for media players. While competitors may eventually appropriate the iPod's inner workings, as utility patents expire, they will risk litigation if their products come too close to the trademarked shape of the iPod, including its popular circular-touchpad interface.

Moreover, trademark law allows the holder to sue not only manufacturers but also distributors of competing products whose attributes so resemble those of the protected mark that they create the likelihood of confusion in the marketplace