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Open Source and Patents

By Laura A. Majerus
January 03, 2005

A patent gives its owner the right to exclude others from making, using, and selling the claimed invention. Thus, patent rights give a patentee great control over who uses his invention. In contrast, the basic idea behind distributing software under an Open Source license is that anyone should be able to view and use the source code of the computer program and modify it for his own use. (The source code is the human readable version of the software.) A business decision to distribute software under an Open Source license affects how the author of the software may be able to use his patent rights, but does not affect whether he can or should apply for patent protection.

Defining Open Source Licenses

A large number of licenses are categorized by the term Open Source (see www.opensource.org/licenses/) and each has its own quirks. The Open Source license that I am asked about most frequently is the Gnu Public License (the gpl). A copy of the gpl can be obtained at www.opensource.org/licenses/gpl-license. This article focuses mainly on the gpl.

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