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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For questions concerning the use of linked libraries such as DLLs and linked JARs.
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Questions about or relating to the Java language, platform or virtual machine. See the JVM (Java Virtual Machine).
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For questions about generating revenue from an open project
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Questions for the retention and building of community audiences, as well as the contributor and developer communities, that concern open projects.
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For questions about the Mozilla Public License (MPL), a license created and maintained by the Mozilla Foundation.
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For questions relating to Creative Commons' Attribution (CC-BY) license.
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Questions about GNU Project (free software, mass collaboration project) or GNU Operating System (a Unix-like computer operating system composed wholly of free software).
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For questions about applying open source principles to hardware design, including schematics, HDL source code and integrated circuit layout data.
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The public domain contains works that have no copyright on them, either because the author dedicated it to the public domain or because copyright has expired.
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For questions about the terms used in the field: their use, effects, and meanings.
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For questions about the process of publishing free/open projects, involving decisions such as whether to provide binary builds or which packaging system to use
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Questions about the enforcement of a license; or what to do when someone violates the terms of a license
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For questions about the information about a project, specifically the documentation of the source code. Questions can relate to best practices, procedures, policies and more.
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Questions about the linux-kernel, a popular kernel of GNU/Linux operating system.
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For questions about ownership of any component within an open project, including but not limited to, rights, intellectual property, and copyright.
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Questions about the definition of free software according to the Free Software Foundation
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For questions that relate to the Python programming specifically
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For questions about the various distributions of the Linux OS, such as their origins and specific impacts on the community.
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For questions relating to law or registered trademarks of software projects. When asking a legal question, be sure to make note of the relevant legal jurisdiction in your question.
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a superset of copyright, and also includes patents, trademarks and trade secrets.
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a computer file that is not a text file. In this context this means a program that instead of being source code is compiled for a specific architecture and cannot (easily) be read by …
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used for concerns about licenses to software and what rights one grants.
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For questions about restrictions on open licenses, and for questions about placing restrictions, or handling restrictions with open projects
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an open project or license concerns the specific use or interaction with an Application Programming Interface (API).
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For questions about the Creative Commons "CC0" public domain dedication that allows copyright holders to place works in the public domain to the extent legally possible, worldwide
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For questions about security practices as applied to open source software.
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For questions about exceptions to open source licenses