The music industry has presented Napster with a list of 135,000 songs that it claims are being illegally traded over the peer-to-peer MP3 swapping network, the Industry Standard reports.

Under a procedure laid out by a federal judge, Napster has until Wednesday to remove the songs from a central index that helps subscribers locate and download songs on other users' computers. The list of songs comes from BMG, Warner Brothers Music Group, EMI, Universal Music Group and Sony Music Entertainment - the so-called Big Five record labels which first sued Napster for copyright infringement in December 1999.

Napster began blocking a limited number of song titles last Sunday, but the filter could be circumvented using minor variations in a song's file name.

Removal responsibility The Recording Industry Association of America, the body that represents the music industry, provided the list four days after Judge Marilyn Hall Patel issued an injunction detailing who was responsible for removing copyrighted music from the Napster indexes.

The injunction said copyright holders must provide Napster with song titles, artist names and the names of computer files under which a song is traded, along with certification of copyright ownership. Napster then has three business days to purge the files from its system. Napster is also responsible for removing file names with minor spelling variations when it is "reasonable" to assume they denote copyrighted songs.

Napster has successfully made peace with only one of the major labels. A ground-breaking pact in October with BMG parent Bertelsmann gave Napster $60 million to build anti-piracy measures into its software. More importantly, it served as a model that Napster has desperately hoped other major labels would follow. Napster's only real chance of survival is striking deals with the rest of the industry.