Caldera International

SCO Group, Inc.

Type	Public
Industry	Operating system software
Founded	Lindon, Utah (Caldera, 1994)
Headquarters	Lindon, Utah, United States
Key people	Ralph Yarro III, Chairman Darl McBride, CEO (2002–2009) Ken Nielsen, CFO Ryan E. Tibbitts, General Counsel Jeff Hunsaker, President of SCO Operations Inc Ransom Love, Founder (Caldera) Doug Michels, Founder (SCO) Larry Michels, Founder (SCO)
Products	UnixWare, OpenServer, Me Inc. Mobility Products, SCO Mobile Server, HipCheck
Revenue	$15.6 million USD (2008)
Net income	($8.7 million) USD (2008)
Number of employees	63 (2009)
Website	www.sco.com

SCO, The SCO Group, The TSG Group, Caldera Systems, and Caldera International are the various names of an American software company that became known for acquiring the Santa Cruz Operation's Server Software and Services divisions, and UnixWare and OpenServer technologies, and then pursuing a series of legal battles known as the SCO-Linux controversies.

The company was part of the Canopy Group, but became independent in March 2005, after the settlement of a lawsuit between the Noorda family and a chairman of the group, Ralph Yarro, also former CEO of the Canopy Group. As part of the settlement, Canopy transferred all of its shares to Yarro. Later on, Caldera International changed its name to "SCO" and then to "The SCO Group" to reflect that change in focus.

In January 2004, their website, www.sco.com, was attacked by the Mydoom computer virus, which took down the website for 2 weeks using a DDoS attack.

In September 2007, SCO filed for Chapter 11 bankruptcy protection. In April 2011, UnXis, Inc. (currently Xinuos) bought The SCO Group, Inc. operating assets and intellectual property rights after having been approved by the bankruptcy court in Delaware. The SCO Group, Inc. then renamed itself TSG Group, Inc. In August 2012, TSG Group, Inc. filed to convert from Chapter 11 bankruptcy protection to Chapter 7 stating "There is no reasonable chance of rehabilitation". On June 14, 2013, Judge David Nuffer ruled on SCO v. IBM motions, granting SCO's motion for reconsideration and reopening the case.

Santa Cruz Operation (SCO) was a software company based in Santa Cruz, California which was best known for selling three UNIX variants for Intel x86 processors: Xenix, SCO UNIX (later known as SCO OpenServer), and UnixWare. In his book The Art of Unix Programming, Eric Raymond calls SCO the "first UNIX company". Prior to this UNIX vendors were either computer hardware manufacturers or telephone companies.