"Peer to peer" networks like Kazaa could prevent users from downloading music, movies and other copyrighted material if they had any desire to do so, media and technology experts said on Tuesday.

Kazaa, Morpheus and other peer-to-peer networks are hailed as a revolutionary technology that allows users to swap any sort of digital material directly, but they have drawn withering criticism for their ability to make copyrighted material and hardcore pornography widely available for free.

In a letter to Congress, an adult-video firm said Kazaa's parent company had the ability to monitor activity on the network and could stop copyright violations if it wished.

Titan Media's claim was backed up by two independent technology experts, who said such filtering technology exists and could be deployed easily and affordably.

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