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A source-available license grants users access to source code, allowing them to view, modify, and sometimes distribute the code. However, there may be restrictions or limitations imposed. These restrictions most often include limitations on commercial use, restrictions on redistributing modified versions, or requirements to share modifications with the original developer without necessarily making them public.

Dual Licensing (or multi-licensing) is the practice of releasing source code under multiple licenses.  Most open source software is published and distributed under the rubric of a single license: Apache, GPL, Mozilla or about one hundred other licenses recognized by the Open Source Initiative.

Dual licensing, while adding complexity to use and management of open source software, serves several needs and application use cases: