NewsFactor reports that the SCO Group is upping “the ante in its efforts to enforce the company’s intellectual-property rights” by “requiring thousands of Unix licensees to verify in writing that they have not violated source-code agreements.”

SCO also is “sending letters to businesses outlining what it claims is evidence of copyright infringement by commercial-Linux users.” SCO already sent letters to Fortune 1000 users earlier this year warning about possible copyright concerns involving Linux and Unix.

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