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SCO Sends Copyright Violation Warning To Linux Customers: Page 2 of 6

"Certain copyrighted application binary interfaces have been copied verbatim from our copyrighted Unix code base and contributed to Linux for distribution under the General Public License (GPL) without proper authorization and without copyright attribution," SCO writes in the letter. "The Unix ABIs were never intended or authorized for unrestricted use or distribution under the GPL in Linux.

"And distribution of Linux by a software vendor or re-distribution of Linux by an end user that contains any of the identified Unix code violates SCO's rights under the DMCA," the letter concludes.

This latest claim, separate and distinct from the contractual violation charges that SCO filed against IBM last March, maintains that the use of the ABIs by customers -- and vendors -- violates SCO's copyright rights.

SCO has not yet proved any claims against Linux in a court of law, a fact that has caused consternation among Linux vendors, customers and open source advocates who vehemently dispute all of SCO's highly publicized IP claims.

An SCO spokesman also said the company sent out hundreds of letters to Unix licensees demanding they provide written certification that each licensee is in full compliance with the AT&T Unix source code agreement. SCO has approximately 6,000 licensees total.