Addamax
Encyclopedia
Addamax is an American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 software company founded in 1986 in Champaign, Illinois
Champaign, Illinois
Champaign is a city in Champaign County, Illinois, in the United States. The city is located south of Chicago, west of Indianapolis, Indiana, and 178 miles northeast of St. Louis, Missouri. Though surrounded by farm communities, Champaign is notable for sharing the campus of the University of...

 by Dr. Peter A. Alsberg. They developed Trusted operating system
Trusted operating system
Trusted Operating System generally refers to an operating system that provides sufficient support for multilevel security and evidence of correctness to meet a particular set of government requirements....

s based on ATT System V and Berkeley (BSD) variants of UNIX
Unix
Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...

. The company had a sales and development office in Gaithersburg, Maryland
Gaithersburg, Maryland
Gaithersburg is a city in Montgomery County, Maryland, United States. The city had a population of 59,933 at the 2010 census, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville...

.

Addamax filed a high profile anti-trust lawsuit in 1991 against the Open Software Foundation
Open Software Foundation
The Open Software Foundation was a not-for-profit organization founded in 1988 under the U.S. National Cooperative Research Act of 1984 to create an open standard for an implementation of the UNIX operating system.-History:...

 also known as OSF, alleging that OSF created a cartel
Cartel
A cartel is a formal agreement among competing firms. It is a formal organization of producers and manufacturers that agree to fix prices, marketing, and production. Cartels usually occur in an oligopolistic industry, where there is a small number of sellers and usually involve homogeneous products...

 that controlled the UNIX operating system and exerted monopsony
Monopsony
In economics, a monopsony is a market form in which only one buyer faces many sellers. It is an example of imperfect competition, similar to a monopoly, in which only one seller faces many buyers...

price fixing.

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