Linus Torvalds, creator of the popular Linux computer operating system, defended his work yesterday as not always lovely but original - and certainly not copied, as a Utah company has contended.

The Utah company, the SCO Group, has begun sending out a round of warning letters to large corporate users of Linux, which is distributed free. The letters, dated Friday, assert that Linux, a variant of the Unix operating system, violates an SCO license and copyright. SCO, based in Lindon, Utah, owns the rights to the Unix operating system.

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