The Napster software (http://www.napster.com), launched early in 1999, allows internet users to share and download MP3 files directly from any computer connected to the Napster network. The software is used by downloading a client program from the Napster site and then connecting to the network through this software, which allows sharing (uploading and downloading) of MP3 files between all users connected to the network. While Napster does not condone copyright infringement, there is no opportunity in the software to stop this, or for royalties to be paid to artists whose songs are being duplicated for free.
Unlike similar file-sharing applications (Gnutella, Freenet), Napster limits users to uploading/downloading of MP3 files only. These files are compressed wave (.wav) files. The advantage of MP3 files is that they are approximately one-tenth the size of the corresponding .wav file and can be close-to-CD-quality. It is for this reason that many artists, record labels and other music industry stakeholders are concerned by the MP3 file format and applications like Napster that simplify the sharing of copyrighted material.
Other file formats in common use on the Internet are not as threatening to the recording industry;
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