The Open Source Definition
The Open Source Initiative's definition is widely recognized as the standard or de facto definition. Raymond and Perens formed the organization in February 1998. With about 20 years of evidence from case histories of closed and open development already provided by the Internet, OSI continued to present the "open source" case to commercial businesses. They sought to bring a higher profile to the practical benefits of freely available source code, and wanted to bring major software businesses and other high-tech industries into open source.
OSI uses The Open Source Definition to determine whether it considers a software license open source. The definition was based on the Debian Free Software Guidelines, written and adapted primarily by Bruce Perens. Perens did not base his writing on the "four freedoms" of Free Software from the FSF, which were only widely available later.
Under Perens' definition, open source describes a broad general type of software license that makes source code available to the general public with relaxed or non-existent copyright restrictions. The principles, as stated, say absolutely nothing about trademark or patent use and require absolutely no cooperation to ensure that any common audit or release regime applies to any derived works. It is an explicit "feature" of open source that it may put no restrictions on the use or distribution by any organization or user. It forbids this, in principle, to guarantee continued access to derived works even by the major original contributors.
Read more about this topic: Open Source Software
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