SCO Group has significantly widened its Unix and Linux lawsuit against IBM, adding a copyright infringement claim to the already complicated case, sources said Thursday.

Copyright infringement is a major new element to SCO's current accusations that IBM breached its contract with SCO and misappropriating trade secrets by moving technology developed for proprietary Unix to open-source Linux. The case has injected some uncertainty into a computing industry that for the most part has eagerly embraced Linux, but analysts such as IDC say the suit doesn't appear to have slowed the operating system's growth.

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