Napster has stepped up its filtering efforts, but has left many users angry over the number of non-copyrighted titles it accidentally blocked as a result.
Over the weekend, users have been sending thousands of song titles to the file share service to be unblocked, at Napster's request.
Others have given up on the service. One post to Napster's forums read: "The Napster that was, No longer is! What's left is a disease ridden rotting corpse, that the vultures are already picking apart, even though the heart still beats ... barely. Wouldn't it be more humane to just pull the plug and let it die with dignity?"
Last week, Napster admitted on its forum pages that its renewed filtering attempts had resulted in "substantial additional 'overblocking'", what it defined as "the unintentional removal of otherwise authorised works".
One user complained that any title that contained the word "remix" in it, appeared to have been blocked.
But Napster clearly had to do something to stave off the threat of closure from US District Court Judge Patel, who called Napster's early filtering attempts "disgraceful". Currently, Patel is waiting for a report on Napster's filtering system from a court-appointed technical expert before making a further decision on its future.
Napster said the new measures were partly inspired by attempts to bypass existing filtering through renaming of files. It has also said it will implement acoustic fingerprinting technology as soon as possible.
The firm has warned that it will expel users who continue to try and circumvent filtering through renaming files.
A post on its website reads: "While many of the variations in artist and title names are the natural result of individuals naming their own files, some of the variations are deliberate attempts to evade the filters and share material over the Napster service, that would otherwise be blocked.
"Napster's terms of service prohibit the use of evasive measures such as pig latin, napcameback, napsterdecoder and otherwise deliberately altering file names in order to evade Napster's filters. Users found to be employing such evasive techniques will receive a warning and those who continue to share such files will be blocked from using the Napster service."
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