December 16, 2004 4:00 AM PST

New CD copy-lock technology nears market

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version of its products.

It also may be a tricky job to make rules associated with copy-protected discs match those associated with songs purchased from online stores such as Napster or Apple Computer's iTunes. Those stores allow their customers to burn CDs that can then be copied without restriction; by contrast some labels want to limit the number of times a copied CD can be duplicated again--a technology called "secure burning."

First 4 Internet's entry into the market marks a potentially new twist on the basic technology, however. The company got its start by offering a tool to identify pornographic images in Web sites and e-mails, and selling the technology to Web-filtering companies for their own products.

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