The recording industry has ordered Napster to remove 135,000 songs by Wednesday, which it claims are being illegally traded over the controversial song swapping service.
The list of songs comes from BMG, Warner, EMI, Universal and Sony, which first sued Napster for copyright infringement in December 1999.
A spokeswoman for the Recording Industry Association of America (RIAA) said the list was emailed to Napster late on Friday and confirmed that additions to the list will be sent to the service provider over the next few weeks.
The RIAA said its members expected Napster to find ways to block all the instances of a song even if the title was changed. Under a court injunction issued on 5 March, Napster is required to bar the transfer of specified songs within three days of notification by the copyright holders.
The list was released four days after US District Judge Marilyn Hall Patel issued a preliminary injunction spelling out who was responsible for removing copyrighted music from the Napster indexes.
Judge Patel issued the revised injunction in response to an order from an appeals court which ruled that Napster had 72 hours to comply with requests from record labels to ban specific songs. However, it is unclear what would happen if Napster failed to comply.
The order also requires Napster to help monitor for misspellings and other variations that are slipping through filters. Napster had begun blocking a limited number of song titles last weekend but the filter could be eluded by using minor variations in a song's file name.
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