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Open-source licenses are software licenses that allow content to be used, modified, and shared. They facilitate free and open-source software (FOSS) development. Intellectual property (IP) laws restrict the modification and sharing of creative works. Free and open-source licenses use these existing legal structures for an inverse purpose. They ...
There are licenses accepted by the OSI which are not free as per the Free Software Definition. The Open Source Definition allows for further restrictions like price, type of contribution and origin of the contribution, e.g. the case of the NASA Open Source Agreement, which requires the code to be "original" work.
Under Perens' definition, open source is a broad software license that makes source code available to the general public with relaxed or non-existent restrictions on the use and modification of the code. It is an explicit "feature" of open source that it puts very few restrictions on the use or distribution by any organization or user, in order ...
In contrast, the definitions of free software and open-source software are much narrower. Free software and/or open-source software is also always source-available software, but not all source-available software is also free software and/or open-source software. This is because the official definitions of those terms require considerable ...
While the goals behind the terms are different, open-source licenses and free software licenses describe the same type of licenses. [13] The two main categories of free and open-source licenses are permissive and copyleft. [14] Both grant permission to change and distribute software. Typically, they require attribution and disclaim liability.
The Open Source Initiative defines a permissive software license as a "non-copyleft license that guarantees the freedoms to use, modify and redistribute". [6] GitHub's choosealicense website describes the permissive MIT license as "[letting] people do anything they want with your code as long as they provide attribution back to you and don't hold you liable."
For information on software-related licences, see Comparison of free and open-source software licenses. A variety of free-content licences exist, some of them tailored to a specific purpose. Also listed are open-hardware licences, which may be used on design documents of and custom-made software for open-source hardware.
The Open Source Definition is the most widely used definition for open-source software, [22] and is often used as a standard for whether a project is open source. [17] It and the official definitions of free software by the Free Software Foundation (FSF) essentially cover the same software licenses.