Free Software Definition Vs Open Source Definition
Despite the fundamental philosophical differences between the free software movement and the open source movement, the official definitions of free software by the Free Software Foundation and of open source software by the Open Source Initiative basically refer to the same software licences, with a few minor exceptions. While stressing the philosophical differences, the Free Software Foundation comments:
The term “open source” software is used by some people to mean more or less the same category as free software. It is not exactly the same class of software: they accept some licences that we consider too restrictive, and there are free software licences they have not accepted. However, the differences in extension of the category are small: nearly all free software is open source, and nearly all open source software is free.
— Free Software Foundation, http://www.gnu.org/philosophy/categories.html
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