On August 10, the US Court of Appeals for the Second Circuit rejected Xinuos's appeal, bringing a close to one of the longest-running legal disputes in open source history. The ruling affirms the decision by the US District Court for the Southern District of New York (SDNY) and establishes that claims regarding Linux code ownership are time-barred, effectively preventing Xinuos from seeking damages from IBM and Red Hat.

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The Final Verdict on Project Monterey

The dispute traces back to 1998, when IBM partnered with Santa Cruz Operation (SCO), Intel, and Sequent to develop Project Monterey, a multi-architecture UNIX system. As Linux gained traction, IBM shifted its focus to the open source kernel, contributing code derived from those early collaborations. In 2011, Xinuos acquired SCO's UNIX business and filed a new lawsuit against IBM and Red Hat in 2021, arguing that contributing code to Linux violated the original non-exclusive licenses. The Court ruled that the case is too old for relitigation and that Xinuos was effectively arguing ownership rather than licensing, a claim now expired.

The Shadow Over Open Source Code Lifts

This decision closes a chapter that began in 2003, when SCO filed its first billion-dollar lawsuit against IBM. The previous article Unix and the endless case: Xinuos strikes back at IBM had documented Xinuos's return to court, but the current ruling marks a point of no return. For the open source community, the verdict removes the legal uncertainty that has hung over Linux for more than two decades, allowing IBM and Red Hat to operate without the risk of future litigation on this specific front.

Xinuos's Last Procedural Chances

Despite the defeat, Xinuos has announced its intention to seek a full-bench rehearing. According to IBM's legal representatives, the probability of this request being granted is 0.03%, making it a desperate move rather than a concrete legal strategy. The case thus concludes with the echo of a battle that, had it succeeded for Xinuos, could have exposed billions of Linux devices to licensing uncertainty and royalties.

Impact on the Ecosystem

The end of this legal dispute strengthens the legitimacy of the open source model and reduces legal costs for companies contributing to the kernel. As highlighted in Linux surpasses 10% market share in North America: Windows loses ground, Linux is experiencing unprecedented growth; the removal of this legal threat is a key factor in consolidating enterprise adoption.