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The Unix Ownership Lawsuit That Will Outlive Us All

A decades-old legal dispute over UNIX code ownership has resurfaced, with a company called Xinuos — which acquired SCO's software assets — now suing IBM over claims that Big Blue improperly used SCO-owned code in Linux and its own operating systems. The case originated in 2003 when SCO alleged IBM contributed proprietary UNIX code from the failed "Project Monterrey" collaboration to open-source Linux, and has continued in various forms despite a 2021 settlement between the original parties. A recent hearing revisited familiar arguments about code ownership and licensing rights, with a key question being whether Xinuos even has legal standing to pursue the case at this stage.

Some legal disputes age like fine wine. This one has aged like a carton of milk left in a server room.

The question of who owns UNIX has been rattling around courts since 2003, and thanks to a hearing on June 22nd, it is apparently not done with us yet.

The backstory, for those who haven't had the misfortune of following it: back in 1998, IBM and a company called the Santa Cruz Operation struck an alliance. SCO sold a flavour of UNIX built for x86 hardware, and together with Intel and Sequent, the two companies launched something called Project Monterrey. The goal was a unified UNIX capable of running across multiple processor architectures. By 2001, they were close to pulling it off.

Then Linux happened. IBM looked at the landscape, decided the open-source upstart was the future, and walked away from Monterrey. SCO's allegation, which has since spawned a litigation dynasty, was that IBM didn't just walk away quietly. It supposedly took code from the joint project and folded it into Linux, AIX, and its Z operating systems. SCO believed it owned that code. So it sued.

SCO itself never really recovered financially, but the lawsuit proved too tempting to abandon. The prospect of being declared part-owner of chunks of the Linux codebase, and extracting money from IBM accordingly, kept various interested parties nursing the case along. It finally wheezed to a settlement in 2021, with IBM paying nothing and admitting nothing.

But before that settlement, SCO had flogged its software assets to a company called Xinuos. And Xinuos decided the fight wasn't over.

The June 22nd hearing was, by all accounts, a very 2025 affair. It was held online, and the judge was briefly on mute without realising it. Beyond that, however, the arguments were pure 2003: who owned what code, when did they own it, does old litigation bind this new one, did IBM ever actually hold a valid licence for SCO's contributions to Project Monterrey.

The more pressing procedural question, which the court now has to untangle, is whether Xinuos has any standing to bring this case at all. There's an argument that the original contractual language set a deadline for disputes that expired long ago. If that's right, Xinuos has been fighting a case it was never entitled to bring.

We'll find out eventually. Probably around the same time someone installs Linux on their parents' laptop without being asked.

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